Kids try to "catch" the bouncy balls on this second grade math worksheet by solving subtraction problems with three-digit numbers using regrouping.

On this second grade math worksheet, kids help Cory the Cow by solving subtraction problems with two-digit numbers and no regrouping.

Kids complete each equation on this third grade math worksheet by determining whether an equation is addition or subtraction and writing in the correct sign.

On this third grade math worksheet, kids round to estimate the difference between two numbers, a useful strategy for checking the results of calculations.