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You count the number of figures from left to right starting with the first number different from 0.

Example:

205 has 3 significant figures

0.0000205 has 3 significant figures

0.000020500000 has 8 significant figures

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Q: What are the rules in determining the number of significant figures?
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What are the rules to be followed in determining the number of significant figures?

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Why do scientists use the rules for determining significant figures?

If they did not use rules all their calculations would simply lead to random digits!


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