This product contains addition and subtraction word problems with different unknowns. They will either solve for the total or one of the addends. This engaging activity is differentiated by having 12 number story cards with 2 digit numbers and another set using 3 digit numbers. These cards can be posted around the room and students can walk around to find the cards and solve the problems. A worksheet is included where students can show their work and record their answers. These story problems can also be used as a math center.