Adding and Subtracting Sig Figs - Tecumseh Local School ...

Adding and Subtracting Sig

Figs

Adding and Subtracting Significant

Figures

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When adding and subtracting decimals, the

answer must have the same number of

digits to the right of the decimal point as

there are in the measurement with the

fewest digits to the right of the decimal.

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¨C

Step #1 ¨C Calculate an answer

Step #2 ¨C Identify the number in the problem

with the fewest digits to the right of the decimal

Step #3 ¨C Round your answer so that it has the

same number of digits to the right of the decimal

as the number in Step #2

Examples

Example

2.21

- .012

__________

Multiplication and Division of Significant

Figures

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When multiplying or dividing, the answer can

have no more significant figures than are in

the measurement with the fewest number of

significant figures

¨C

¨C

Step #1 ¨C Calculate the Answer

Step #2 ¨C Identify the number in the problem with

the fewest number of significant figures

Step #3 ¨C Round your answer to the same number

of significant figures as the number is Step #2

¨C

?

Ex.

Examples

20.1

X 5.2

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