The common-core math standards require that students learn the standard algorithm for multi-digit adding and subtracting—you know, the process in which you line the numbers up vertically to add or ...

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

Become the math teacher your future students need. There’s a difference between learning a subject and learning to teach it. You’ll want to do both to be the kind of teacher that inspires their ...