Over the past year, since I took over the common-core math beat, I’ve been thinking a lot about fractions. As I wrote in November, the Common Core State Standards for mathematics emphasize fractions ...

Use visual fraction models to add and subtract fractions with the same denominators. Use visual fraction models to add and subtract fractions with the same denominators. Notice patterns in the ...

Have you ever tried to add or subtract fractions that have different denominators? It’s tricky, right? Join Ms. Susanna Post in this lesson to learn how to solve these types of challenging problems!

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 ...