Playing with Numbers

A **factor** of a number is an exact divisor of that number.

Example: 3 is an exact divisor of 15 (15 = 3 × 5). So, 3 is a factor of 15.

2 is not an exact factor of 17 (since any whole number multiplied with 2 does not give 17). So, 2 is not a factor of 17.

We can find the multiples of a given number by multiplying 1, 2, 3 …, to the number.

Example: To find the multiples of 12, we need to calculate as follows:

12 × 1 = 12, 12 × 2 = 24, 12 × 3 = 36, 12 × 4 = 48 …, and so on.

So, the numbers 12, 24, 36, 48, etc., are the multiples of 12.

**Prime numbers**are numbers having exactly two factors: 1 and the number itself. For example, the factors of 23 are 1 and 23 only. So,…

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