Divisibility Rules
Divisibility by 2
Look at the last digit of the number, is it 0, 2, 4, 6, 0r 8 ?
If it is means that the number can be divisible by 2.
EXAMPLE:
456 ---> it IS a multiple of 2 because the last number ( i mean 6) is even.
25 ----. it is NOT divisible by 2 because the last number is IS NOT EVEN.
Divisibility by 3
A number can be divisible by 3 if the sum of all the digits of the number is multiple of 3.
EXAMPLE:
2079 -----> it IS divisible by 3, because if you add all the numbers it gives you a multiple of 3.
2+0+7+9 =18 ---> 18 is a multiple of 3.
928 ------> it is NOT divisible by 3, because if you add all the digits the result is not a multiple of 3.
Divisibility by 4
A number is divisible by 4, if the last 2 digits of the number are multiple of 4.
EXAMPLE:
4624 ------> it IS divisible by 4, because when you look at the last two numbers (24) you notice that it is a multiple of 4.
Divisibility by 5
Numbers ending in a 5 or a 0 are always divisible by 5.
EXAMPLE:
25, 50, 100, 5675 -------> they ARE divisible by 5 because they all end in 0 or 5.
Divisibility by 6
If the Number is divisible by 2 and 3 it is divisible by 6 also. Be careful! it is not one or the other. The number must be divisible by both 2 and 3 before you can conclude that it is divisible by 6.
EXAMPLE:
6294 -------> this number is divisible by 2, because it ends with an even number, and it is divisible by 3 because if you add them up it gives you 21. So, it IS divisible by 6.
Divisibility by 9
the rule is almostthe same as the rule for divisibility by 3. A number can be divisible by 9 if the sum of the digits are a multiple of 9.
EXAMPLE:
46926 -------> 4+6+9+2+6= 27------> 27 IS a multiple of 9. So, it IS divisible by 9.
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