The set comes with 156 lowercase letters, 52 uppercase letters, 17 numbers and math symbols, a double-sided magnet board, two whiteboard markers and one eraser — aka everything you could ...

In math, a permutation is the number of ways a set can be arranged. For example, there are two permutations for a set consisting of the numbers 2 and 7 (the permutations are 2,7 and 7,2).

Teaching set theory to six-year-olds as a way into mathematics, from arithmetic on, would come to be considered misguided, overcomplicating the basics and introducing jargon. Yet however radical a ...

For example, one infinity—the one most people are familiar with—is an infinite set of natural numbers: 1, 2, 3, and so on. However, there’s also an infinite set of real numbers, which ...

A child's ability to understand and manipulate sets of numbers in 1st grade predicts how well he or she will succeed in the math required both in secondary school and for day-to-day living ...