Rules for recognizing sig figs - Humble Independent School ...
Name _______________________ Per ___
Rules for recognizing sig figs
1. non-zero #s count
2. zeros sandwiched in between count
3. zeros at the end
*after (to right of) decimal count
*before decimal (left of) must be
designated with:
- a bar over the zero
- or, a decimal after the zero
- or, by scientific notation
4. zeros in front do not count
5. counted numbers and defined constants
have an infinite # of sig figs
Addition and Subtraction Sig Fig Rules
1. line up the decimals
2. draw a line to the right of the number with
the least precision (shortest column)
3. answer can’t go past the line
4. use the 1st digit past the line to determine
where to round off
Multiplying and Dividing Sig Fig Rule
Answer can have no more digits (sig figs) than
the measured factor with the
fewest number of digits.
127.3 x 42 = 5,346.6
2 digits ( answer must be 2 sig figs
5,300
Name _______________________ Per ___
Rules for recognizing sig figs
1. non-zero #s count
2. zeros sandwiched in between count
3. zeros at the end
*after (to right of) decimal count
*before decimal (left of) must be
designated with:
- a bar over the zero
- or, a decimal after the zero
- or, by scientific notation
4. zeros in front do not count
5. counted numbers and defined constants
have an infinite # of sig figs
Addition and Subtraction Sig Fig Rules
1. line up the decimals
2. draw a line to the right of the number with
the least precision (shortest column)
3. answer can’t go past the line
4. use the 1st digit past the line to determine
where to round off
Multiplying and Dividing Sig Fig Rule
Answer can have no more digits (sig figs) than
the measured factor with the
fewest number of digits.
127.3 x 42 = 5,346.6
2 digits ( answer must be 2 sig figs
5,300
-----------------------
Practice Determining which Zeros are Significant
Tell how many sig figs in each number.
1. 967 ______ 11. 2,700 _____
2. 967,000 _____ 12. 304 _____
3. 96.7 _____ 13. 47.0 _____
4. 9.67 _____ 14. 90 _____
5. 0.00967 _____ 15. 900.0 _____
6. 9.6700 _____ 16. 0.90 _____
7. 300.4 _____ 17. 909 _____
8. 2,700 _____ 18. 0.08009 _____
9. 7.0200 _____ 19. 0.050 _____
10. 54.000 _____ 20. 5000 _____
21) 2001.46 + 4.023 + 3.2 =
22) 549.607 - 4.32 =
23) 1,489.2 + 5.0092 + 4.68 =
24) 16.5 x 4.9320 =
25) 4.234 x 0.024 =
26) (5.32 x 107) x (1.434 x 103) =
27) 27,000 ÷ 3.456 =
28) 4.75 x 105 =
2.25 x 102
29) 3.35 x 0.5657 x 23 =
30) 1500 x 5205.5 =
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
21) 2001.46 + 4.023 + 3.2 =
22) 549.607 - 4.32 =
23) 1,489.2 + 5.0092 + 4.68 =
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
24) 16.5 x 4.9320 =
25) 4.234 x 0.024 =
26) (5.32 x 107) x (1.434 x 103) =
27) 27,000 ÷ 3.456 =
28) 4.75 x 105 =
2.25 x 102
29) 3.35 x 0.5657 x 23 =
30) 1500 x 5205.5 =
Practice Determining which Zeros are Significant
Tell how many sig figs in each number.
1. 967 ______ 11. 2,700 _____
2. 967,000 _____ 12. 304 _____
3. 96.7 _____ 13. 47.0 _____
4. 9.67 _____ 14. 90 _____
5. 0.00967 _____ 15. 900.0 _____
6. 9.6700 _____ 16. 0.90 _____
7. 300.4 _____ 17. 909 _____
8. 2,700 _____ 18. 0.08009 _____
9. 7.0200 _____ 19. 0.050 _____
10. 54.000 _____ 20. 5000 _____
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