When do zeros count as significant figures?

Zeros between nonzero digits and trailing zeros with a decimal count; leading zeros do not count.

How do I count sig figs in 0.002040?

0.002040 has 4 significant figures.

What rule do I use for addition and subtraction with sig figs?

Match the least number of decimal places in the inputs.

What rule do I use for multiplication and division with sig figs?

Match the least number of significant figures in the inputs.

Does scientific notation change the number of significant figures?

No; count only the digits in the coefficient. For example, 4.00×10^2 has 3 significant figures.

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