Let's find the difference between 8 and 15. Can you use these blocks to help you work out the answer? You could also use a number line to count on. Count on from 8 to 10, which is 2. Then count on ...

Fourth grade math teacher Catherine Schwartz helping a student use number sense for complicated subtraction at Nashville Classical Charter School in Nashville, Tennessee. (Holly Korbey for The ...

Subtraction’s standard algorithm is an ... The post The building blocks of math that students need to excel — but aren’t always getting appeared first on The Hechinger Report.