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The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1 × 10⁻³ are
- 5, 1, 2
- 5, 1, 5
- 5, 5, 2
- 4, 4, 2
Correct answer: 5, 1, 2
Solution
The number 23.023 has five significant figures because all non-zero digits and the zero between them count. The number 0.0003 has only one significant figure, which is the '3', as leading zeros do not count. Lastly, 2.1 × 10⁻³ has two significant figures, which are '2' and '1', as the scientific notation indicates that these digits are significant.
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