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The numbers 1, 2, 3, 4, 5, 6, 7, 8, and 9 are always significant. The number 0 is significant only if it is between two of those numbers, or if it at the end of a number with a decimal.

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10y ago
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8y ago

10.40 has 4 significant figures.

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Q: How many significant figures does 10.40 have?
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