Using Benchmark Fractions to Estimate Sums & Differences

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What is a benchmark fraction?

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A benchmark fraction is a simple fraction that is used as a reference point to estimate the value of other fractions. Common benchmark fractions include 0, 1/2, and 1.

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

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How do you estimate the sum of two fractions?

Back

To estimate the sum of two fractions, round each fraction to the nearest benchmark fraction and then add the rounded values.

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The sum is estimated to be greater than 1.

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How can you determine if a fraction is greater than or less than 1?

Back

If the numerator is greater than the denominator, the fraction is greater than 1. If the numerator is less than the denominator, the fraction is less than 1.

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

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Back

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CCSS.8.NS.A.2

Front

How do you estimate the difference between two fractions?

Back

To estimate the difference, round each fraction to the nearest benchmark fraction and then subtract the rounded values.

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Mia uses about 1 bag of gravel in one day.

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Back

Tags

CCSS.4.NF.A.2

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Back

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the purpose of using benchmark fractions in estimation?

Back

Benchmark fractions simplify the process of estimating sums and differences of fractions by providing easy reference points.

Tags

CCSS.4.NF.A.2