1. Cut out the calculator below, and then cut along the dotted lines inside of it. 2. Decorate your calculator with Crayola® crayons, markers, or colored pencils. 3. Print out the “Calculator Addition Strip” and “Calculator Subtraction Strip” activity pages. 4. Cut out the addition or subtraction strip and slide it through the slot at the top of the calculator. 5. Line up the numbers so they appear in the open spaces. Fold the flap over to hide the answers. 6. Figure out the answers to the problems, and write them on the folded-over flap. 7. Lift the flap to check your answers!