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# Uncertainty in Addition and Subtraction

## Rounding according to the measurement with the least number of decimal places.

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.

## Uncertainty in Addition and Subtraction

This concept describes the steps to take when dealing with issues of adding and subtracting values with differing numbers of significant figures.

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• Video

## Addition and Subtraction with Significant Figures

Provides guided examples where viewers are asked to preserve significant figures in problems involving addition and subtraction.

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## Uncertainty in Addition and Subtraction Quiz

Reviews the rules for rounding values obtained by addition or subtraction.

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• Practice
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## Uncertainty in Addition and Subtraction Practice

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To encourage students to generate questions, activate their prior knowledge, and collect information to answer their own questions using a Question and Answer Table.

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• Real World Application

## Rounding Up or Down?

Explains the rules for rounding numbers and how banks round numbers.

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