Teachers, save “Scratch and Subtract” to assign it to your class.

1. Use the eraser tool to scratch off any box from the six boxes within the green rectangle. You will reveal a hidden number. Use the to write this number at the top of the subtraction problem. 2. Use the eraser tool again to scratch off any box from the nine boxes within the purple rectangle. You will reveal another hidden number. Use the to write this number under the top number in the subtraction problem. 3. Use the to solve the problem. 4. Tap