Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04...
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Transcript of Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04...
![Page 1: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/1.jpg)
Whole Number Arithmetic
Rounding and estimating
![Page 2: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/2.jpg)
Round to the nearest whole number
• 621.8• 19.02• 57.04• 98.63• 1.03• 610.8• 519.6
• 622• 19• 57• 99• 1• 611• 520
![Page 3: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/3.jpg)
Round to one decimal place
• 19.023• 57.046• 81.774• 89.522• 1.03• 2.59• 49.97
• 19.0• 57.0• 81.8• 89.5• 1.0• 2.6• 50.0
![Page 4: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/4.jpg)
Round to two decimal places
• 1.902• 5.704• 0.1036• 2.974• 0.006• 3.899• 0.003
• 1.90• 5.70• 0.10• 2.97• 0.01• 3.90• 0.00
![Page 5: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/5.jpg)
The reading 4.1 kg, has two significant figures.
![Page 6: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/6.jpg)
The width of the footpath is 1.81m (to the nearest cm)
![Page 7: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/7.jpg)
The width of the footpath is 1.81m (to the nearest cm)
How many significant figures?
![Page 8: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/8.jpg)
Complete this table
Rounded width Significant Figures
1.81
2
1
![Page 9: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/9.jpg)
Complete this table
Rounded width Significant Figures
1.81 3
1.8 2
2 1
![Page 10: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/10.jpg)
Round to one significant figure
• 7.56• 2.7• 4.6• 10.6
• 8• 3• 5• 10
![Page 11: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/11.jpg)
How many significant figures?
• 9.6• 2.5• 55.1• 1.26• 22.4• 178.3• 8.75• 3.24
• 2• 2• 3• 3• 3• 4• 3• 3
![Page 12: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/12.jpg)
How many significant figures?
• 46.81• 3.808• 4.077• 71.08• 83.881• 778.049
• 4• 4• 4• 4• 5• 6
![Page 13: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/13.jpg)
How many significant figures?
• 400.00• 40.0• 1.4• 1.40• 1.400• 10.0• 1.50• 100.00
• 5• 3• 2• 3• 4• 3• 3• 5
![Page 14: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/14.jpg)
• The length of this pencil is 83 mm to the nearest mm.
• 83 mm has been rounded to two significant figures.
• 83 mm = 0.083 m• 0.083 m also has two
significant figures.
![Page 15: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/15.jpg)
How many significant figures?
• 0.061• 0.007• 0.00061• 0.46• 0.070• 0.0700• 0.0074• 0.07006
• 2• 1• 2• 2• 2• 3• 2• 4
![Page 16: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/16.jpg)
Exercise 9
Rounding
![Page 17: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/17.jpg)
Round the lengths of N. Z. Rivers to the nearest 10 Km.
• Waikato• Clutha• Wanganui• Taieri• Rangitiki• Waitaki
• 425• 322• 290• 288• 241• 209
![Page 18: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/18.jpg)
Round the lengths of N. Z. Rivers to the nearest 10 Km.
• Waikato• Clutha• Wanganui• Taieri• Rangitiki• Waitaki
• 425 = 430• 322 = 320• 290 = 290• 288 = 290• 241 = 240• 209 = 210
![Page 19: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/19.jpg)
Round the heights of N. Z. Mountains to the nearest 100 m.
• Cook• Tasman• Ruapehu• Taranaki• Ngauruhoe• Tongariro
• 3764• 3498• 2797• 2518• 2291• 1968
![Page 20: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/20.jpg)
Round the heights of N. Z. Mountains to the nearest 100 m.
• Cook• Tasman• Ruapehu• Taranaki• Ngauruhoe• Tongariro
• 3764 = 3800• 3498 = 3500• 2797 = 2800• 2518 = 2500• 2291 = 2300• 1968 = 2000
![Page 21: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/21.jpg)
Round the areas of N. Z. Lakes to the nearest 1000 ha.
• Taupo• Te Anau• Wakatipu• Wanaka• Manapouri• Hawea
• 60 606• 34 447• 29 267• 19 166• 14 245• 11 914
![Page 22: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/22.jpg)
Round the areas of N. Z. Lakes to the nearest 1000 ha.
• Taupo• Te Anau• Wakatipu• Wanaka• Manapouri• Hawea
• 60 606 = 61 000• 34 447 = 34 000• 29 267 = 29 000• 19 166 = 19 000• 14 245 = 14 000• 11 914 = 12 000
![Page 23: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/23.jpg)
Round the areas of N. Z. Regions correct to 2 significant figures.
• Northland
• Auckland
• Waikato
• Bay of Plenty
• Gisborne
• Hawkes' Bay
• Taranaki
• Manawatu - Wanganui
• Wellington
• 13 941
• 5 600
• 25 598
• 12 447
• 8 351
• 14 164
• 7 273
• 22 215
• 8 124
![Page 24: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/24.jpg)
Round the areas of N. Z. Regions correct to 2 significant figures.
• Northland
• Auckland
• Waikato
• Bay of Plenty
• Gisborne
• Hawkes' Bay
• Taranaki
• Manawatu - Wanganui
• Wellington
• 13 941 = 14 000
• 5 600 = 5 600
• 25 598 = 26 000
• 12 447 = 12 000
• 8 351 = 8 400
• 14 164 = 14 000
• 7 273 = 7 300
• 22 215 = 22 000
• 8 124 = 8 100
![Page 25: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/25.jpg)
Round the population of N. Z. Regions correct to 3 significant figures.
• Nelson• Tasman• Marlborough• West Coast• Canterbury• Otago• Southland• New Zealand
• 40 279• 37 973• 38 397• 32 512• 468 040• 185 083• 97 100• 3 618 302
![Page 26: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/26.jpg)
Round the population of N. Z. Regions correct to 3 significant figures.
• Nelson• Tasman• Marlborough• West Coast• Canterbury• Otago• Southland• New Zealand
• 40 279 = 40 300• 37 973 = 38 000• 38 397 = 38 400• 32 512 = 32 500• 468 040 = 468 000• 185 083 = 185 000• 97 100 = 97 100• 3 618 302 = 3 620 000
![Page 27: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/27.jpg)
This table shows the population of Auckland's 4 cities rounded to the nearest 1000.
Copy down and complete the table.
City Population Min. Pop Max. Pop
North Shore 172 000 171 500 172 499
Waitakere 156 000
Auckland 346 000
Manukau 254 000
![Page 28: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/28.jpg)
This table shows the population of Auckland's 4 cities rounded to the nearest 1000.
Copy down and complete the table.
City Population Min. Pop Max. Pop
North Shore 172 000 171 500 172 499
Waitakere 156 000 155 500 156 499
Auckland 346 000 345 500 346 499
Manukau 254 000 253 500 254 499
![Page 29: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/29.jpg)
Exercise 10
Approximate Calculations
![Page 30: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/30.jpg)
Oral examples - 1
• a. 90 x 6• b. 90 x 60• c. 900 x 60• d. 900 x 600
• 540• 5400• 54 000• 540 000
![Page 31: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/31.jpg)
Oral examples - 2
• a. 80 x 5 • b. 80 x 50 • c. 800 x 50 • d. 800 x 500
• 400• 4000• 40 000• 400 000
![Page 32: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/32.jpg)
Oral examples - 3
= 50
![Page 33: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/33.jpg)
Oral examples - 3
= 50
![Page 34: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/34.jpg)
Oral examples - 3
= 500
![Page 35: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/35.jpg)
Oral examples - 3
= 500
![Page 36: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/36.jpg)
Oral examples - 4
= 200
![Page 37: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/37.jpg)
Oral examples - 4
= 200
![Page 38: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/38.jpg)
Oral examples - 4
= 2000
![Page 39: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/39.jpg)
Oral examples - 4
= 2000
![Page 40: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/40.jpg)
Written examples
1. 80 x 7
2. 80 x 70
3. 800 x 70
4. 800 x700
• 560• 5600• 56 000• 560 000
![Page 41: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/41.jpg)
Written examples
5. 40 x 5
6. 40 x 50
7. 400 x 50
8. 400 x 500
• 200• 2000• 20 000• 200 000
![Page 42: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/42.jpg)
9.
= 50
![Page 43: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/43.jpg)
10.
= 50
![Page 44: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/44.jpg)
11.
= 500
![Page 45: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/45.jpg)
12.
= 500
![Page 46: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/46.jpg)
13.
= 200
![Page 47: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/47.jpg)
14.
= 20
![Page 48: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/48.jpg)
15.
= 2000
![Page 49: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/49.jpg)
16.
= 2000
![Page 50: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/50.jpg)
Estimation
Answers are not exact
![Page 51: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/51.jpg)
Exercise 10
17. 91 x 18 18. 82 x 2919. 73 x 36 20. 64 x 4721. 621 x 1922. 685 x 3223. 817 x 38 24. 893 x 51
• 90 x 20 ≈ 1800• 80 x 30 ≈ 2400• 70 x 40 ≈ 2800• 60 x 50 ≈ 3000• 600 x 20 ≈ 12000• 600 x 30 ≈ 18000• 800 x 40 ≈ 32000• 900 x 50 ≈ 45000
![Page 52: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/52.jpg)
25.
≈ 5
![Page 53: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/53.jpg)
26.
≈ 2
![Page 54: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/54.jpg)
27.
≈ 4
![Page 55: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/55.jpg)
28.
≈ 3
![Page 56: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/56.jpg)
29.
≈ 40
![Page 57: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/57.jpg)
30.
≈ 30
![Page 58: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/58.jpg)
31.
≈ 20
![Page 59: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/59.jpg)
32.
≈ 50
![Page 60: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/60.jpg)
33.
≈ 400
![Page 61: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/61.jpg)
34.
≈ 2500
![Page 62: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/62.jpg)
35.
≈ 90 000
![Page 63: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/63.jpg)
36.
≈ 160 000
![Page 64: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/64.jpg)
37.
≈ 10
![Page 65: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/65.jpg)
38.
≈ 20
![Page 66: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/66.jpg)
39.
≈ 30
![Page 67: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/67.jpg)
40.
≈ 100
![Page 68: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/68.jpg)
41.
≈ 40
![Page 69: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/69.jpg)
42.
≈ 20
![Page 70: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/70.jpg)
43.
≈ 60
![Page 71: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/71.jpg)
44.
≈ 30
![Page 72: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/72.jpg)
45.
≈ 2
![Page 73: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/73.jpg)
46.
≈ 4
![Page 74: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/74.jpg)
47.
≈ 6
![Page 75: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/75.jpg)
48.
≈ 3
![Page 76: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/76.jpg)
49.
≈ 8 000
![Page 77: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/77.jpg)
50.
≈ 27 000
![Page 78: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/78.jpg)
51.
≈ 160 000
![Page 79: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/79.jpg)
52.
≈ 810 000
![Page 80: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/80.jpg)
53.
• The sun is 150 million kilometres from the earth. Light travels a distance of 300 000 kilometres every second. Find, in seconds, how long it takes light from the sun to reach the earth.
![Page 81: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/81.jpg)
53.
• The sun is 150 million kilometres from the earth. Light travels a distance of 300 000 kilometres every second. Find, in seconds, how long it takes light from the sun to reach the earth.
![Page 82: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/82.jpg)
54.
• The earth travels 958 million kilometres in its orbit around the sun each year (365 days). By rounding off each number correct to 1 significant figure calculate how far the earth travels in
• 1 hour.
![Page 83: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/83.jpg)
54.
• The earth travels 958 million kilometres in its orbit around the sun each year (365 days). By rounding off each number correct to 1 significant figure calculate how far the earth travels in
• 1 hour.
![Page 84: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/84.jpg)
55.
• Repeat question 54 only use a calculator to do the actual calculation. (Round off your answer correct to 2 significant figures.)
![Page 85: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/85.jpg)
55.
• Repeat question 54 only use a calculator to do the actual calculation. (Round off your answer correct to 2 significant figures.)
• 110000 km
![Page 86: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/86.jpg)
56.
• Use a calculator to help you find how many days there are in 1 million seconds. (Round off your answer correct to 3 significant figures.)
![Page 87: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/87.jpg)
56.
• Use a calculator to help you find how many days there are in 1 million seconds. (Round off your answer correct to 3 significant figures.)
• 11.6 days
![Page 88: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/88.jpg)
Making Estimates
Continued
![Page 89: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/89.jpg)
Fill the gaps
Item Unit cost ($)
Quantity Estimated cost ($)
Apples 1.83 4
Chickens 8.95 9
Calculator 16.85 7
DVD 9.95 10
![Page 90: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/90.jpg)
Fill the gaps
Item Unit cost ($)
Quantity Estimated cost ($)
Apples 1.83 4 8
Chickens 8.95 9 81
Calculator 16.85 7 140
DVD 9.95 10 100
![Page 91: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/91.jpg)
Fill the gaps
Item Unit cost ($)
Quantity Estimated cost ($)
Hairdryer 23.15 38
Toaster 47.95 27
Shorts 14.85 74
Chairs 83.75 65
![Page 92: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/92.jpg)
Fill the gaps
Item Unit cost ($)
Quantity Estimated cost ($)
Hairdryer 23.15 38 800
Toaster 47.95 27 1500
Shorts 14.85 74 700
Chairs 83.75 65 5600
![Page 93: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/93.jpg)
Fill the gaps
Item Total cost Quantity Estimated unit cost
Shorts 64.91 7
Books 47.99 8
Heaters 3385 9
Fridges 6725 7
![Page 94: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/94.jpg)
Fill the gaps
Item Total cost Quantity Estimated unit cost
Shorts 64.91 7 9
Books 47.99 8 6
Heaters 3385 9 400
Fridges 6725 7 1000
![Page 95: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/95.jpg)
Fill the gaps
Item Total cost Quantity Estimated unit cost
Watches 2225 51
Shoes 4309 78
Calculator 2683 92
Trousers 3416 83
![Page 96: Whole Number Arithmetic Rounding and estimating. Round to the nearest whole number 621.8 19.02 57.04 98.63 1.03 610.8 519.6 622 19 57 99 1 611 520.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649ee95503460f94bfaf92/html5/thumbnails/96.jpg)
Fill the gaps
Item Total cost Quantity Estimated unit cost
Watches 2225 51 40
Shoes 4309 78 50
Calculator 2683 92 30
Trousers 3416 83 40