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 ...

A key part—though surely not the only part—of early-grades math is ensuring students get the basic arithmetic functions down and, beyond that, making sure they’re able to swiftly and automatically ...

Multiplication is calculating the sum of groups of the same size. There are lots of ways to build and describe multiplication problems. Using repeated addition, you can add equal groups together, one ...