Friday, December 16, 2011

Divisibility Rules

1-all whole numbers are divisible by 1.

2-even numbers are divisible by two eg:0,2,4,6,8,10

3-the sum of a digit must be a multiple of three.

4-all whole numbers that are divisible by two twice are divisible by 4.

5-all whole numbers ending with a 0 or a 5.

6-all numbers that are divisible by 2 and 3 are divisible by 6.

8-numbers that can be divided by two three times are divisible by 8.

9-all whole numbers who's sum is divisible by 9.

10-all whole numbers ending with a zero are divisible by 10, eg:10,20,30

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