1. Ways to Check for Divisibility
Divisibility Rules
Sound=20century
Ways to Check for Divisibility

2. All numbers are divisible by 1
Dividing By 1
All numbers are divisible by 1
All 2 easy

3. Are these numbers divisible by 1?
Now You Try
Are these numbers divisible by 1?
578
398 48
1903
490

4. Dividing by 2 All even numbers are divisible by 2
Even numbers are numbers that end with either 2, 4, 6, 8, or 0
groovy

5. Are these numbers divisible by 2?
Now You Try
Are these numbers divisible by 2?
458
1279
759
555
1050

6. Dividing by 3 Add up the digits of the number
If that number is divisible by 3, then the original number is
If your sum is still a big number, continue to add the digits
Nice

7. Dividing by 3 3 7 8
For example, take the number
Add up the digits of the number 18 7 + 3 + 8 =
If that number is divisible by 3, then the original number is
Is 18 divisible by 3?
Oh yeah!
If your sum is still a big number, continue to add the digits
1 + 8 = 9
Is 9 divisible by 3?

8. Are these numbers divisible by 3?
Now You Try
Are these numbers divisible by 3?
639 56 86
360
468

9. If the last 2 digits together are divisible by 4
Dividing by 4
If the last 2 digits together are divisible by 4
Great scott

10. Are these numbers divisible by 4?
Now You Try
Are these numbers divisible by 4?
584
261 56
920
767

11. Dividing by 5
If the number ends in 5 or 0
Great balls of fire

12. Are these numbers divisible by 5?
Now You Try
Are these numbers divisible by 5?
554
6890
345
902
845

13. Dividing by 6 If the number is divisible by 2, and . . .
nice

14. Are these numbers divisible by 6?
Now You Try
Are these numbers divisible by 6?
897
258
630
345 84

15. Dividing by 7 Take the last digit in a number.
Double and subtract the last digit in your number from the rest of the digits.
Repeat the process for larger numbers.
Example: 357 (Double the 7 to get 14. Subtract 14 from 35 to get 21 which is divisible by 7 and we can now say that 357 is divisible by 7

16. Are these numbers divisible by 7?
Now You Try
Are these numbers divisible by 7?
578
398 48
1903
490

17. Dividing by 8 If the last three digits are divisible by 8
If the number is divisible by 2,
then by 2 again, and then by 2 again
Sound=impressive
So what type of number does it have to be?

18. Are these numbers divisible by 8?
Now You Try
Are these numbers divisible by 8?
568
396 48
1903
490

19. If that number is divisible by 9 then your number is divisible by 9
Dividing by 9
Similar to dividing by 3
Add up digits
If that number is divisible by 9 then your number is divisible by 9

20. Dividing by 9
For example, take the number 924,561
Add up the digits of the number 27 9 + 2 + 4 + 5 + 6 + 1 =
If that number is divisible by 3, then the original number is
Is 27 divisible by 9?
Oh yeah!
If your sum is still a big number, continue to add the digits
2 + 7 = 9
Is 9 divisible by 9?

21. Are these numbers divisible by 9?
Now You Try
Are these numbers divisible by 9?
578
398 48
1903
490

22. If the number ends with a 0
Dividing by 10
If the number ends with a 0
All 2 easy

23. Are these numbers divisible by 10?
Now You Try
Are these numbers divisible by 10?
578
398 48
1903
490

24. Dividing by 11

25. Are these numbers divisible by 11?
Now You Try
Are these numbers divisible by 11?
578
398 48
1903
490

26. That's all Folks!
That’s all folks