ABSTRACT
This chapter focuses on accuracy, flexibility, efficiency, and automaticity. It also focuses on three main strategies that when working with subtraction with larger numbers. The first strategy is getting students to bridge back through 10. In this strategy student will count back from the minuend using larger jumps and use 10 as a bridge. The second strategy is the idea that subtraction includes finding the distance between two numbers. This thinking is related to the inverse relationship between addition and subtraction. The third strategy is if students have an automatic recall of their addition facts they can then know the answer to the related subtraction problem without having to do any jumps at all. After students have learned the strategy, play Subtract 10 or 1s from a teen number Bingo with the whole class. Activities should be scaffolded so that students can build conceptual understanding, work on pictorial representations, and make sense of the abstract representations.
