Significant Figures
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Rules for Determining the Number of Significant Figures in a Measurement

Chem 1115

1. All non-zero digits are significant.
2. Zeros located between 2 non-zero digits are significant.
3. Leading zeros (those at the start of a number) are never significant.
4. Trailing zeros (those at the end of a number) are never significant unless they are preceeded by a decimal point somewhere in the number.

Chem 1215

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Practice Problems

How many signficant figures are present in each of the following measurements?

1. 5.13

2. 100.01

3. 0.0401

4. 0.0050

5. 220,000

6. 1.90 x 10³

7. 153.000

8. 1.0050

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