123 mm = _________ dm 123 mm mm m 1000 1 = 1.23 dm m1 dm 10 XX Day 5 10-15.
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Transcript of 123 mm = _________ dm 123 mm mm m 1000 1 = 1.23 dm m1 dm 10 XX Day 5 10-15.
![Page 1: 123 mm = _________ dm 123 mm mm m 1000 1 = 1.23 dm m1 dm 10 XX Day 5 10-15.](https://reader034.fdocuments.us/reader034/viewer/2022051320/5a4d1b7e7f8b9ab0599ba116/html5/thumbnails/1.jpg)
123 mm = _________ dm
123 mmmm
m1000
1=
1.23 dm
m1dm10
X X
Day 5 10-15
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- A measured digit
- scientists repeat experiments and AMOUNT MATTERS!
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Significant Figure Rules
Rules governing significance:
1. Non-zeros are always Significant (1, 2, 3, 4…).
2. Zeros between non-zeros (sig. figs.) are Always Significant (707).
Think Certainty
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Significant Figure RulesRules governing significance:
3. A final zero or trailing zeros in the decimal portion ONLY are significant (0.010200).
4. Place holders are not significant (0.004, 400)
are significant
are NOT significant
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Significant Figure Rules4. Place holders are not significant
(0.004, 400)
• Zeroes placed before other digits are not significant; 0.046 has two significant digits.
• Zeroes at the end of a non-decimal # are significant only if there is a decimal point (100.). They are NOT sig. if there is not a decimal point (100)
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Significant Figure Rules
1.Non-zeros are Always Significant (1, 2, 3, 4…)
2. Zeros between non-zeros are Always Significant (707)
Another approach
![Page 7: 123 mm = _________ dm 123 mm mm m 1000 1 = 1.23 dm m1 dm 10 XX Day 5 10-15.](https://reader034.fdocuments.us/reader034/viewer/2022051320/5a4d1b7e7f8b9ab0599ba116/html5/thumbnails/7.jpg)
Left of the decimal Right of the decimalIs the zero by its self Is there a non-zero
If yes = Not sig. anywhere to the left
If no is there a dec. – if yes = sig.
Pt. to the right if yes
= Significant
0.006
10.0506
2020
3. Other Zeros
- 1
- 6
- 3
Another approach
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Left of the decimal Right of the decimalIs the zero by its self Is there a non-zero
If yes = Not sig. anywhere to the left
If no is there a dec. – if yes = sig.
Pt. to the right if yes
= Significant
200
20.0
200.
3. Other Zeros
- 1
- 3
- 3
Another approach
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Significant Figure Practice7.0080
0.00640
70.0
7.07001
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HANDOUTS
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1. Hand in handout – Conversions Assignment
2. Complete # 74 on page 96 (they must be correct and you must show work)
3. NOTEBOOKS
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1. Explain how you convert from Celcius to Kelvins.
CP
Day 6 10-16
2. Convert 4500 micrograms to milligrams.
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1. How many sig. figs.?
a. 72010
b. 710.00
c. 0.006
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How is certainty expressed in measurements and simple calculations?
CP
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Rules For Multiplying And Dividing With Sig. Figs.1. Do the Math – Get an answer2. Go Back to your original Numbers and Count Significant Figures3. Use the least # of Significant Figures (from your original #s) For your answer
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Rules For Multiplying And Dividing With Sig. Figs.
1. 20. * 10 =
2. 0.010 * 20.0 =2 3
2 1200 = 200
0.2 = 0.20
3. 10.0 / 5.5 =3 2
1.8181…= 1.8
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Significant Figure Rules•To eliminate sig. figs. ROUND
•To add sig. figs. Use a dec. pt. OR add zeros
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Practicing Multiplying And Dividing With Sig. Figs.
1. 2.00 * 1.0
2. 10.1 / 2.5
= 2.0
= 4.0
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Significant Figure Rules
Practice Assignment
Notebook Checks
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Day 1 10-17
1. Convert 1,200 km to dm.
2. How many sig. figs.:
0.0170
700.010
3. Calculate with sig figs.:
21.3 * 10.
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Significant Figure Rules
What are the rules for
multiplying and dividing?
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Discussion partner review – it’s graded!!!
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Rules For Adding And Subtracting With Sig. Figs.
1. Do the Math – Get an answer2. Go Back to your original Numbers and find the last significant digit (farthest to the right) – underline it in each original number.3. Find the underlined digit farthest to the left and round your answer to that place
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1. 20. + 10 =
2. 0.010 + 20.0 =
30 = 30
3. 10. - 5.5 = 4.5 = 5
Rules For Adding And Subtracting With Sig. Figs.
20.01 = 20.0
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1. 41. + 20 =
2. 0.010 - 12.34 =
61 = 60
Practice Adding And Subtracting With Sig. Figs.
- 12.330 =
- 12.33
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Significant Figure Rules
Practice Packet