Answer :

A multiple is a number that results from multiplication of two numbers. So multiples of 3 are 3, 6, 9, 12, and so on. Multiples of 10 are 10, 20, 30, 40, 50...etc.
AL2006
A multiple of a number is the answer you get when you multiply that number by any whole number.

Examples:

The first multiple of  3  is  3 x 1 = 3

The fourth multiple of  3  is  3 x 4 = 12

The fourth multiple of  7  is  7 x 4 = 28