Topic 2 Review. How could you estimate 4,789 + 3,153 Estimating makes problems easier! Round first,...
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Transcript of Topic 2 Review. How could you estimate 4,789 + 3,153 Estimating makes problems easier! Round first,...
Topic 2 Review
How could you estimate4,789 + 3,153
• Estimating makes problems easier!Round first, then add!
4,789 + 3,153
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
5,000 3,000+8,000
How could you estimate this to the nearest thousand?15,165 + 24,986
• Estimating makes problems easier!Round first, then add!
15,165 + 24,986
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
15,000 25,000+40,000
How could you estimate this to the nearest thousand?8,722 + 16,110
• Estimating makes problems easier!Round first, then add!
8,722 + 16,110
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
9,000 16,000+25,000
How could you estimate this to the nearest thousand?8,722 + 16,110
• Estimating makes problems easier!Round first, then add!
8,722 + 16,110
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
9,000 16,000+25,000
How could you estimate this to the nearest thousand?16,056 – 14,896
• Estimating makes problems easier!Round first, then subtract!
16,056 – 14,896
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
16,000 15,000-1,000
How could you estimate this to the nearest whole number?9.63 + 4.25
• Estimating makes problems easier!Round first, then add!
9.63 + 4.25
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
10.00 4.00+14
This means the 1’s place!
How could you estimate this to the nearest whole number?12.34 – 8.69
• Estimating makes problems easier!Round first, then subtract!
12.34 - 8.69
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
12.00 9.00-3
This means the 1’s place!
How could you estimate this to the nearest whole dollar?$3.65 - $1.36
• Estimating makes problems easier!Round first, then subtract!
$3.65 - $1.36
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
$4.00 $1.00-$3.00
This means the 1’s place!
How could you estimate this to the nearest whole number?320.08 – 114.56
• Estimating makes problems easier!Round first, then subtract!
320.08 – 114.56
Find your place, look next door! Five or greater, add 1 more. Numbers to the left stay the same. Numbers to the right- zero’s your name!
320.00 115.00-
205.00
This means the 1’s place!
Round this number to the nearest tenth.
12.6512.70 or 12.7
Round this number to the nearest tenth.
24.4324.40 or 24.4
Round this number to the nearest tenth.
13.2713.30 or 13.3
Round this number to the nearest tenth.
8.598.60 or 8.6
You can add and subtract numbers with decimals!
What are the three rules?(This is my boring guy voice talking!)
1. LINE UP THE DECIMALS!2. Add or subtract normally.3. Make sure you have the decimal
in the answer.
You can do it!
2.6 + .14
2 614
0+
472
You can do it!
1.52 + 1.61
1 56
1
2+
3131 1
3.13
You can do it!
1.54 – 0.36
1 53
4
4-
8110 6
1.18
14
You can do it!
1.26 – 0.18
1 21
1
6-
8010 8
1.08
16
WHOLE
PART PART
5 fruit
3 apples 2 oranges
WHOLE
PART PART
7 pets
3 dogs 4 cats
WHOLE
PART PART
$3.35 cost
$.85 for coke $2.50 for chips
What do I know?So what can I figure out?
WHOLE
PART PART
$3.35 cost
$.85 for coke $2.50 for chips
What do I know?So what can I figure out?
http://www.mathplayground.com/PartPartWhole.html
Here’s a fun game you can play to practice more!
B.A.S.OTeach your parent or sibling all about a way we can practice borrowing in a subtraction problem!
3 0 5 1 - 1 4 8 2
You have to borrow from mom!
So now mom only has 4 ten dollar bills, but you have 11
dollars! So you’ve borrowed, added
back….. now start over!
4 11
9
Now Mom has to borrow from Dad!
But wait! He’s broke!!Dad- Go borrow from Grandma!
2 10Now Grandma has 2 thousand-
dollar bills, and Dad has ten hundred dollar bills!
We’ve borrowed, added back, now start over!
9
Oh wait, Mom needs to borrow from Dad!
9 14
Now Dad has 9 hundred-dollar bills, and Mom has 14 ten dollar
bills!We’ve borrowed, added back,
now start over!
651 ,
There are tons of subtraction problems with borrowing on the test!
DO BASO, take your time, use your strategies, and you’ll be fine!
To practice more skills from the test, visitDaily Math on my website!
STUDY HARD & GOOD LUCK! I know you can do it!!!