Divisibility Rules

Kimberly Jessica

6

When a number is divisible by 2 and 3. It can't just be divisible by 2 it has to be divisible by 2 and 3. Use counting numbers.


Ex:

1. 12. 12 is divisible by 2 and 3. 12 / 3 = 4. 12 / 2 = 6

2. 24. 24 is divisible by 2 and 3. 24 / 2 = 12. 24 / 3 = 8

3. 664. 664 is divisible by 2 but not 3. 664 / 2 = 332. 664 / 3 = 221 R 1.

9

When the sum of a numbers digits is divisible by 9. Use counting numbers. Make sure there are no remainders.

Ex:

1. 5643. 5+6+4+3= 18/9=3. Good

2. 333. 3+3+3= 9/9= 1. Good

3. 721. 7+2+1= 10/9=1 R1. Bad



Divisibility Rules

Divisibility Rules

5

When a number ends in 0 or 5. Use counting numbers.


Ex:

1. 60. 60 ends in 0 so it can be divided by 5.

2. 75. 75 ends in 5 so it can be divided by 5

3. 33. 33 ends in 3 so it can not be divided by 5.


10

When a number ends in 0. Use counting numbers.


Ex:

1. 50 50 ends in 0 so it can be divided by 10.

2. 21. 21 ends in 1 so it can't be divided by 10.

3. 3000. 3000 ends in 0 so it can be divided by 10.

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