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Assuming the trailing zero is not there for decorative purposes, three.

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3 of them.

Q: How many significant figures are in 0.0290?

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How many significant figures are in 20.8

20.2 has three significant figures.

4 significant figures.

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3 significant figures.

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The significant figures in 0.000042500 are: 0.0000425. So, there are 8 significant figures.