Question

estimate the sum or difference. 4/5+3/7, round 4/5 to its closest benchmark. round 3/7 to its closest benchmark. add to find the estimate.

Answer 1

About 1.5

Explanation:

We can round 4/5 to 1.

We can round 3/8 to 4/8 = 1/2.

So our estimate is

4/5 + 3/8 =

about 1 + 1/2 = 1.5

(Shh... let's check using the calculator... it's 1.2. We were pretty close!)