2. Get out your pencils and whiteboards for math today!!! Divisibility Chapter 4 Section 1

3. “Divisible BY” What does it mean?

4. “Divisible by” means: If you divide one number by another, the result is a whole number WITHOUT a remainder. Examples: 12 ÷ 6 = 2 No remainder 15 ÷ 5 = 3 No remainder

5. Divisibility Why learn divisibility? For the same reasons you memorize BASIC math FACTS It makes MATH a little easier. If you don’t learn divisibility, you may take LONGER and have more TROUBLE.

6. Divisibility Rule 2 If the last digit of the number is even, then you know that 2 is a factor. (0, 2, 4, 6, 8) Examples:783470 Review Even numbers: ghosteven ghosteven

7. Now You Try: Which number IS NOT divisible by 2? 5721464249 Need More Practice: Numbers Divisible by 2Numbers Divisible by 2

8. WONDERFUL

9. It ends in a 0, 2, 4, 6, or 8.

10. Divisibility Rule 3 If the sum of the digits is divisible by 3, then you know 3 is a factor. Examples: 75 7 + 5 = 12 12 ÷ 3 = 4 No Remainder 369 3 +6 + 9 = 18 18 ÷ 3 = 6 No Remainder

11. Now You Try: Which number IS NOT divisible by 3? 5721464279 Need More Practice: Numbers Divisible by 3Numbers Divisible by 3

12. The sum is divisible by 3.

13. WONDERFUL

14. Divisibility Rule 4 If the last two digits of the number are divisible by 4, then 4 is a factor. Examples: 132020 ÷ 4 = 5 67272 ÷ 4 = 18

15. Now You Try: Which number IS NOT divisible by 4? 5644101188 Need More Practice: Numbers Divisible by 4Numbers Divisible by 4

16. WONDERFUL

17. The last 2 digits are divisible by 4.

18. Divisibility Rule 5 If the number ends in 0 or 5, then you know 5 is a factor. If the number ends in 0 or 5, then you know 5 is a factor.Examples: 615ends in a 5 1480ends on a 0

19. Now You Try: Which number IS NOT divisible by 5? 9820 779 560 Need More Practice: Numbers Divisible by 5Numbers Divisible by 5

20. The number ends in a zero or a five.

21. Wonderful

22. Divisibility Rule 6 If the number PASSES the tests for 2 and 3 then 6 is a factor. If the number PASSES the tests for 2 and 3 then 6 is a factor.Examples: 408ends in an even number (2 rule) sum of the digits is divisible by 3 Review prime and composite numbers: Prime and Composite Numbers Prime and Composite Numbers Prime and Composite Numbers

23. Now You Try: Which number IS NOT divisible by 6? 8700523 7602 Need more practice? Numbers Divisible by 6 Numbers Divisible by 6Numbers Divisible by 6

24. Way To Go!!

25. This number is divisible by 2 and 3.

26. Divisibility Rule 8 If the last 3 digits of the number are divisible by 8, then 8 is a factor. Examples: 70,008 is divisible by 8 because 008 is a divisible by 8

27. Now You Try: Which number IS NOT divisible by 8? 1,4707,120 1,590

28. Way To Go!!

29. NO

30. Divisibility Rule 9 If the sum of the digits is divisible by 9, then 9 is a factor. Examples: 963 9 + 6 + 3 = 18 18 ÷ 9 = 2 54455 + 4 + 4 + 5 =18 18 ÷ 9 =2

31. Now You Try: Find the number that IS NOT divisible by 9. 98736365541 Need More Practice: Numbers Divisible by 9 and 10 Numbers Divisible by 9 and 10Numbers Divisible by 9 and 10

32. The sum of the digits is divisible by 9.

33. Great Job!!!

34. Divisibility Rule 10 If the number ends in 0, then you know that 10 is a factor. Example: 7630ends in a zero 410ends in a zero 410ends in a zero

35. Now You Try: Find the number that IS NOT divisible by ten. 56,920 7537870

36. The number ends in a ZERO.

37. Way To Go!!

38. Congratulations! Complete two of the three assignments. You may complete them on your computers but print out your answer sheet. Assignment 1.doc Assignment 1.doc chart.doc assignment3.doc

39. Now that you have completed your two assignments, feel free to go to the following sites. THEY ARE SOOOOO MUCH FUN!!!!!! Fractions vectorkids -divisibility rules Gamequarium Division Games Fractions vectorkids -divisibility rules Gamequarium Division Games Fractions vectorkids -divisibility rules Gamequarium Division Games