A landmark number is a number that makes math simpler by virtue of it being easy to relate to and calculate with, such as the number "10." Most landmark numbers are multiples of 10. More »

In mathematics, a prime number is any whole number greater than one that has no positive factors other than one and itself. For example, the number 17 is prime, because its only factors are one and 17. More »

In math, a composite number is a whole number that can be divided evenly by a number other than itself and one. If a number cannot be divided evenly in this way, it is called a prime number. More »

Pi is a mathematical constant and irrational number representing the ratio of a circle's circumference to its diameter with a value of approximately 3.1416. Even though mathematicians using computers are able to calculat... More »

The number notated by "e" is a famous irrational number known as Euler's number that is approximately equal to 2.72. The number "e" has no final digit and has been calculated accurately to over one trillion digits. More »

Helpful worksheets for practicing math depend on the child’s grade level; for example, first-graders benefit from number order and missing number worksheets, while middle school students benefit from worksheets covering ... More »

A prime number in math is an integer greater than 1 that is evenly divisible by only 1 and the number itself. One is not considered a prime number, because prime numbers by definition have two factors, and the number 1 o... More »