Add and subtract three-digit numbers with Springling and Minni and ... Minni and Subbi are not fans of regrouping. Although they're good friends with T-Pops in Mathville, they really dislike ...

In this lesson, students go over addition and subtraction with regrouping using different strategies to solve. Today we focus on using numbers lines to solve. Julia uses her chart and white board ...

Five, ten, 15, 20, 25 what's the next number? 30! In this lesson we'll look at solving vertical subtraction ... need to cross out my three and make it a two because I'm borrowing a 10.

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 ...