Using Benchmark Fractions to Estimate Sums and Differences

Front

What is a benchmark fraction?

Back

A benchmark fraction is a simple fraction that is easy to work with, such as 0, 1/2, or 1, used to estimate sums and differences.

Front

Round 1/3 to the closest benchmark fraction.

Back

1/2

Front

Round 3/12 to the closest benchmark fraction.

Back

1/2

Front

Round 8/9 to the closest benchmark fraction.

Back

1

Front

If Lisa's fruit salad has 3/4 cup of strawberries, 7/8 cup of peaches, and 1/6 cup of blueberries, how much is left after eating 11/12 cup?

Back

About 1 cup

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

Estimate the sum of 2/3 cup of almonds, 7/8 cup of peanuts, and 4/5 cup of raisins using benchmark fractions.

Back

About 3 cups.

Front

Is the estimate of 3 cups greater than or less than the actual sum of the trail mix?

Back

The estimate is greater because each fraction is rounded up to a benchmark.

Front

What is the closest benchmark fraction to 0.4?

Back

1/2

Front

How do you round 5/8 to the nearest benchmark fraction?

Back

1/2