Question 1

When do zeros count as significant figures?

Accepted Answer

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

Question 2

How do I count sig figs in 0.002040?

Accepted Answer

0.002040 has 4 significant figures.

Question 3

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

Accepted Answer

Match the least number of decimal places in the inputs.

Question 4

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

Accepted Answer

Match the least number of significant figures in the inputs.

Question 5

Does scientific notation change the number of significant figures?

Accepted Answer

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

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Rule For Significant Figures in Multiplication and Division?