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5 significant figures, from the 4 onwards. This assumes the last zero is not a place holder but an indicator of the degree of accuracy.

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13y ago
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Wiki User

7y ago

6 of them.

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7y ago

3 of them.

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7y ago

5 of them.

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Wiki User

13y ago

Six

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Wiki User

12y ago

Three.

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Q: How many significant figures are in a number 0.0040090?
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