Use estimation to determine which expression has the least value

Question

A. 5 3/4 + 2 1/4 - 2 1/8=
8?

B. 6 1/4 + 1 - 1 1/4=
6?

C.8 1/3 - 1 1/2 + 1 1/3=
7?

D? 12 2/5 - 5 +2 4/5=
10?

B has least value

Answer 1

A is wrong. The others are right.

I get the same answer for A as I do for B.