Sig Figs
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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