1. 123 mm = _________ dm Question of the Day 1 m 10 dm 123 mm = X X 1000

2. - scientists repeat experiments and AMOUNT MATTERS!
Significant Figures
What is a sig. fig.?
- A measured digit
Why is it important to understand
what is a certain measurement
and what is not?
- scientists repeat experiments and AMOUNT MATTERS!

3. Significant Figure Rules
Think Certainty
Rules governing significance:
Non-zeros are always Significant (1, 2, 3, 4…).
2. Zeros between non-zeros (sig. figs.) are Always Significant (707).

4. Significant Figure Rules
Rules governing significance:
3. A final zero or trailing zeros in the decimal portion ONLY are significant ( ).
4. Place holders are not significant (0.004, 400)
are significant
are NOT significant

5. Significant Figure Rules
4. Place holders are not significant (0.004, 400)
Zeroes placed before other digits are
not significant; 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)

6. Significant Figure Rules
Another approach
Non-zeros are Always Significant (1, 2, 3, 4…)
2. Zeros between non-zeros are Always Significant (707)

7. Left of the decimal Right of the decimal
Another approach
3. Other Zeros
Left of the decimal Right of the decimal
Is 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
2020
- 1
- 6
- 3

8. Left of the decimal Right of the decimal
Another approach
3. Other Zeros
Left of the decimal Right of the decimal
Is 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.
- 1
- 3

9. Significant Figure Practice
7.0080
70.0

10. To Make a Student Account for Portal:
Go to sburg.org.
Click blue Sapphire link (bottom right).
Click Community Portal Application and Acceptable Use Policy Form (right side).
Keyword = mountie
Scroll down and change drop down to Student Account.
Click Yes and then continue.
Fill out application…

11. Explain how you convert from Celcius to Kelvins.CP
Question of the Day
Explain how you convert from Celcius to Kelvins.
2. Convert 4500 micrograms to milligrams.
Day

12. Practice
How many sig. figs.?
72010
710.00
0.006

13. Objectives / Essential QuestionsCP
Objectives / Essential Questions
How is certainty expressed in measurements and simple calculations?

14. Rules For Multiplying And Dividing With Sig. Figs.
1. Do the Math – Get an answer
2. Go Back to your original Numbers and Count Significant Figures
3. Use the least # of Significant Figures (from your original #s) For your answer 14

15. Rules For Multiplying And Dividing With Sig. Figs.
* 10 =
200 =
200
2 3
* 20.0 =
0.2 =
0.20
3 2
/ 5.5 =
1.8181…=
1.8

16. Significant Figure Rules
To eliminate sig. figs. ROUND
To add sig. figs. Use a dec. pt. OR add zeros

17. Practicing Multiplying And Dividing With Sig. Figs.
* 1.0
= 2.0
= 4.0
/ 2.5

18. Significant Figure Rules
Practice Assignment
Notebook Checks

19. Question of the Day
1. Convert 1,200 km to dm.
2. How many sig. figs.:
0.0170
3. Calculate with sig figs.:
21.3 * 10.
Day

20. Significant Figure Rules
What are the rules for multiplying and dividing?

21. Discussion partner review – it’s graded!!!

22. Rules For Adding And Subtracting With Sig. Figs.
1. Do the Math – Get an answer
2. 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

23. Rules For Adding And Subtracting With Sig. Figs.=
30 = 30 =
20.01 =
20.0 =
4.5 = 5

24. Practice Adding And Subtracting With Sig. Figs.=
61 = 60 = =

25. Significant Figure Rules
Practice Packet