Question

Estimate the sum or difference.Use the benchmarks, 0, 1/2, and 1.

23/40-11/30

A 0
B 1
C 1/2

Answer 1

hmm
23/40 is like 1/2
11/30 is between 1/2 and 0, about 1/3

so

1/2-1/3 is hmm
somewhere between 1/2 and 0, closer to 0 tho

A is answer