Students go over addition and subtraction with regrouping using different strategies. In this lesson, students go over addition and subtraction with regrouping using different strategies to solve ...

Faye Hedrick's third-graders at The Bolles School are scattered around the room in groups of four. Each group has 36 cubes. The task is to divide the cubes equally among all four members of the gro… ...

The Common Core State Standards teach students the algorithm for multi-digit addition and subtraction in 4th grade. But some experts say it should be taught sooner.