Using Benchmark Fractions to Estimate Sums & Differences

Front

What is a benchmark fraction?

Back

A benchmark fraction is a simple fraction that is easy to understand and use for estimation, such as 0, 1/2, or 1.

Front

How do you round the fraction 2/9 to the closest benchmark?

Back

2/9 rounds to 0.

Front

Estimate the fraction 1 8/10. Which benchmark fraction is it closer to?

Back

1 8/10 is closer to 2.

Front

Estimate the fraction 4/5. Which benchmark fraction is it closer to?

Back

4/5 is closer to 1.

Front

How do you estimate the sum of fractions like 5/8 + 11/12?

Back

Replace each fraction with a benchmark fraction (0, 1/2, or 1) to estimate the sum.

Front

What is the estimated sum of 5/8 + 11/12 when using benchmark fractions?

Back

The estimated sum is 1 1/2.

Front

If Mia uses 1/5 of a bag of gravel in the morning and 11/12 in the afternoon, how much gravel does she use in total?

Back

Mia uses about 1 bag of gravel in total.

Front

What is the purpose of using benchmark fractions in estimation?

Back

Benchmark fractions help simplify calculations and make it easier to estimate sums and differences.

Front

What is the benchmark fraction for 0.5?

Back

The benchmark fraction for 0.5 is 1/2.

Front

How can you determine which benchmark fraction a given fraction is closest to?

Back

Compare the given fraction to the benchmark fractions (0, 1/2, 1) and see which one it is nearest to.