Place value in two-digit numbers When you are solving an addition calculation with a two-digit number, you need to think about tens and ones.

NEW YORK -- Now that No. 2 is about to be officially retired in honor of Derek Jeter, the New York Yankees will no longer have any single-digit jersey numbers available for players. Well, except ...

Researchers from 4 projects with a problem-solving approach to teaching and learning multidigit number concepts and operations describe (a) a common framework of conceptual structures children ...

Squaring complex, two-digit numbers in your head isn't that difficult if you know a simple trick, according to the Secrets of Mental Math author Michael Shermer. Photo by farnea.

Benford's law is cannibalistic, much in the same way that a single zero in a bunch of numbers being multiplied together makes the result zero.

Before the concept of zero existed, how did people signify the absence of something?