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

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

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 ...