This Fluency Activity is a part of the Lesson 13, Unit 2, Grade 1. Reviewing subtraction facts supports Grade 1's core fluency standard of adding and subtracting within 10. Provide the number bond template for students who need extra support. Students can place the larger number as the whole and the smaller as a part to figure out the missing part. Students place the deck of cards facedown between them. Each partner flips over two cards and subtracts the smaller number from the larger number.