Estimating Sums and Differences of Fractions 7-1

Front

What is the process of estimating sums and differences of fractions?

Back

Estimating sums and differences of fractions involves replacing each fraction with a simpler value (0, 1/2, or 1) to make mental calculations easier.

Front

Estimate the difference: 5/12 - 2/10

Back

1/2

Front

Estimate the sum: 5/12 + 2/10

Back

1/2

Front

Estimate the difference: 11/20 - 2/35

Back

1/2

Front

Estimate the difference: 24/25 - 9/10

Back

0

Front

What values can fractions be replaced with for estimation?

Back

Fractions can be replaced with 0, 1/2, or 1 for estimation purposes.

Front

Why is estimating sums and differences of fractions useful?

Back

Estimating helps to quickly assess the reasonableness of an answer without performing exact calculations.

Front

What is the estimated value of 3/4 + 1/3?

Back

1/2 (replace 3/4 with 1 and 1/3 with 0)

Front

What is the estimated value of 1/8 - 1/4?

Back

0 (replace 1/8 with 0 and 1/4 with 0)

Front

How do you estimate 7/10 - 3/5?

Back

1/2 (replace 7/10 with 1 and 3/5 with 1)