## Thursday, December 15, 2011

### Divisibility Rules!

1 - all whole numbers are divisible by 1
Eg. 3 divided by 1 = 3

2 - all even numbers are divisible by 2
E V E N - 2, 4, 6, 8,...(and so on.... you know it all)
O D D - 1, 3, 5, 7, 9 .... etc...(you know it all too)

3 - if the sum of the digits is divisible by 3
Eg. 1234 1+2+3+4 = 12 1+2 = 3

4 - All numbers that are divisible by 2 twice
Eg. 16 divided by 2 = 8. 8 divided by 2 = 4
so 16 is divisible by 4

5 - ending in 0 or 5
like in the 5 times table :D

6 - if its divisible by both 2 and 3

7 - *not discovered* but you can make one :D

8 - All numbers that are divisible by 2 thrice
Eg. 24 divided by 2 = 12. 12 divided by 2 = 6. 6 divided by 2 = 3.
24 is divisible by 8

9 - if the sum of the digits is divisible by 9

10 - all numbers ending in 0
like counting by 10's! (ten times table)

0 - no numbers are divisible by 0.

#### 1 comment:

1. Nice job Chantelle!! It helped me understand the rule for 9. To make this post even better maybe you should add a video, link, or even a picture!