Factors are the numbers you multiply together to get another number. For example, both 2 and 3 are factors of number 6. And in numberr 8, there are 3 factors that are identical in value: 2, 2, and 2.  More...

A number is divisible by 2 if the number is even. A number is divisible by 3 if the sum of the digits is divisible by 3.  More...

A Prime number can be divided evenly only by 1 or itself. And it must be a whole number greater than 1.

Prime Factorization is the process of finding all the prime factors of an integer.  More...

How do you find the greatest common factor (GCF) among integers? And how do you find the lest common multiple (LCM) among integers?  More...

Here is a classification of different number types:  More...

A square root of a number is a value that can be multiplied by itself to give the original number. For example, a square root of 9 is 3, because when 3 is multiplied by itself we get 9. Note that -3 is also a square root of 9, because -3 x -3  = 9.  More...

If you do not have a calculator, you can estimate a decimal approximation of the square root of a number. Here is how, using an example. Suppose you want to know the square root of 20.  More...

A Sequence is a set of things (usually numbers) that are in order.

In an Arithmetic Sequence the difference between one term and the next is a constant.

Example: 1, 4, 7, 10, 13, 16, 19, 22, 25, ...

This sequence has a difference of 3 between each number.

Suppose in an arithmetic sequence:  More...

A Sequence is a set of things (usually numbers) that are in order.

In a Geometric Sequence, each term is found by multiplying the previous term by a constant (called “common ratio”).

Example: 2, 4, 8, 16, 32, 64, 128, 256, ...  More...