Teachers, save “How do you add numbers up to 20?” to assign it to your class.

When we want to add numbers quickly, we use shortcuts that help us. These are called strategies. Smart mathematicians choose strategies that work best for their brains. How do you add quickly? Tap the tool to record your voice. Then talk as you solve each addition question with the tool. - Describe your thinking! - Name the strategies you are using. When you are done, tap the to turn in your work.