Sig Figs

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Significant Figure Rules

#1 All non-zero’s are significant.

#2 All zero’s between non-zero’s are significant.

#3 All zero’s before the first non-zero are NOT significant.

#4 All zero’s after the first non-zero in a number with a decimal point are significant.

#5 All zero’s after the last non-zero in a number without a decimal point are NOT significant.

#6 All numbers before the x10^x are significant in scientific notation. The x10^x is NOT significant.

Measurement Rule: Read all instruments to one and ONLY ONE estimate. Significant figures are either measured OR show correct precision for mathematical processes.

Rule examples:

1. 2934 4 SFs

2. 2009 4 SFs

3. 00394 3 SFs

3. 0.0043 2 SFs

4. 0.0340 3 SFs

4. 8000. 4 SFs

4. 5.930 4 SFs

5. 5940 3 SFs

5. 1000 1 SF

6. 2.84 x 104 3 SFs

6. 1.0 x 1010 2 SFs

NUMBER OF SF’s RULES NEEDED

1. 847.99 _______________ _______________

2. 0.943 _______________ _______________

3. 0.93000 5 1, 3, 4

4. 38400 _______________ _______________

5. 00349 _______________ _______________

6. 00349.00 _______________ _______________

7. 90039002 _______________ _______________

8. 9002300 _______________ _______________

9. 930029000. _______________ _______________

10. 0.0039 _______________ _______________

11. 10.0039 _______________ _______________

12. 10.000000 _______________ _______________

13. 2000001 _______________ _______________

14. 2000000 _______________ _______________

15. 2000000. _______________ _______________

16. 2.8400 x 108 _______________ _______________

17. 3 x 1099 _______________ _______________

18. 5.33 x 10380 _______________ _______________

19. 0.00300 _______________ _______________

20. 0034.100 _______________ _______________

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