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 ...

Want to learn more? Sign up for a free five-week email mini-course full of research-backed strategies to help students make sense of math. Fractions are an important building block in students’ ...

Mathematical modeling is the process of developing mathematical descriptions, or models, of real-world systems. These models can be linear or nonlinear, discrete or continuous, deterministic or ...

It’s surprisingly difficult to prove one of the most basic properties of a number: whether it can be written as a fraction. A broad new method can help settle this ancient question. In June 1978, the ...