This SMARTboard lesson is a great way to introduce the concept of addition. The Pumpkin is set up to clone, so you can solve each problem.
Roll the dice and record the number in the first box. Drag the correct number of pumpkins into the box. Repeat for the second box. Add up the number of pumpkins in all and record your answer. Erase your work and do it again. My students love this activity.