CFU Using Benchmark Fractions to Estimate Sums / Differences

Front

What is a benchmark fraction?

Back

A benchmark fraction is a commonly used fraction that helps to estimate and compare other fractions, such as 1/2, 1/4, and 3/4.

Tags

CCSS.4.NF.A.2

Front

How can benchmark fractions help in estimating sums or differences?

Back

Benchmark fractions provide a reference point that makes it easier to approximate the value of sums or differences of fractions.

Tags

CCSS.4.NF.A.2

Front

Estimate the difference: 11/12 - 7/10. What is the estimated value?

Back

Less than 1/2.

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Estimate the difference: 9/11 - 5/12. What is the estimated value?

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1/2.

Front

Estimate the sum: 2/9 + 7/8. What is the estimated value?

Back

1.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

Estimate the sum: 4/5 + 5/9. What is the estimated value?

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1 1/2.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Front

What is the first step in estimating the sum or difference of fractions?

Back

Identify benchmark fractions that are close to the given fractions.

Tags

CCSS.4.NF.A.2

Front

Why is it important to estimate sums and differences of fractions?

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Estimating helps to quickly assess the reasonableness of an answer and simplifies calculations.

Front

What is the sum of 1/2 and 1/2?

Back

1.

Tags

CCSS.4.NF.B.4A

CCSS.4.NF.B.4B

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What is the difference between 3/4 and 1/4?

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1/2.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D