#xmasdollardealsThis Google Slides is perfect to start introducing the Common Core standard, first grade, 1.OA.7. It includes 25 slides where students drag TRUE or FALSE boxes or the different equations in the correct box. The slides build gradually in difficulty, they start by addition sums within 10, move to addition sums within 20, then subtraction sums withing 10 moving on to subtraction sums withing 20. They continue with a mix of addition and subtraction sums withing 10 and then move on to