People often solve simple arithmetic problems, such as basic addition, subtraction, multiplication or division, in their ...

From fractions and decimals to distance and time, the humble-but-versatile number line can deepen students’ understanding of ...

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 ...

All those long multiplication tables. Timed tests and “mad minutes” of worksheet problem-solving. Fluency drills. Somehow, getting kids to know their basic math facts continues to be at the heart of ...