Estimate the sum or difference. use the benchmarks 0, 1/2, and 1. 2/5 + 3/25 = (13/25) 1. 0 2. 1/2 3. 1 . 

First you have to find the common denominator, what does 5 and 25 go into? 25 right. So now you set it up 5/25 is 5 then 5X2 is 10. So your first fraction is 10/25. then you do this to the other side which gives you 3. So now "Just like you have written you have 13/25. Now divide, it gives you .52. if .50 is half, then .52 is close to half. so your answer is B.