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

2. Objective
I will learn divisibility rules in order to help me find factors of whole numbers.

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

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

5. 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

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

7. 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

8. 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?

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

10. 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

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

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

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

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

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

16. Dividing by 7

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

18. 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?

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

20. 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

21. 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?

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

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

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

25. Dividing by 11

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

27. REVIEW Divisible by 1 Divisible by 2 Divisible by 3 Divisible by 4
Is this the end

28. Assignment
Tell what each number is divisible by, either 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11
186 85 69
298
747
952
3650
2738
1132
5084
3870
7896
69095
4892
3487
I like it, I love it, I want some more of it

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