Math word problems #2

What is the number sentence/equation for. Bob had $25 , his sister took some. Now Bob has $10.

Tom had 452 marbles, James gave him some more.Now Tom has 600 marbles. How many did James give?

. It took Bobby 30 mins.to finish the race, and Sam 45 mins. to finish.How much longer was Sam?

There are 563 kid at the fair 279 were in 2nd grade.The rest were in 1st. How many were in 1st?

Jim had a 8 sliced pizza,he gave his sister 3 slices his brother 2. What fraction did Jim eat?