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There are seven significant figures; the first 1 is significant, the 2501 is obvious, but the last two are also significant because they are specifying the exactness of the number.

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14y ago
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9y ago

Four of them. Trailing zeros in a number containing a decimal point are significant.

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13y ago

5 significant figures

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Q: How many significant figures are there in 1.250100?
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