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Get out your pencils and whiteboards for math today!!!

Get out your pencils and whiteboards for math today!!!. Divisibility Chapter 4 Section 1. “Divisible BY” What does it mean?. “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

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Get out your pencils and whiteboards for math today!!!

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

  2. “Divisible BY”What does it mean?

  3. “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

  4. 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.

  5. 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: 78 3470 Review Even numbers: ghosteven

  6. Now You Try: Which number IS NOT divisible by 2? 572 1464 249 Need More Practice: Numbers Divisible by 2

  7. WONDERFUL

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

  9. 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

  10. Now You Try: Which number IS NOT divisible by 3? 572 1464 279 Need More Practice: Numbers Divisible by 3

  11. The sum is divisible by 3.

  12. WONDERFUL

  13. Divisibility Rule 4 If the last two digits of the number are divisible by 4, then 4 is a factor. Examples: 1320 20 ÷ 4 = 5 672 72 ÷ 4 = 18

  14. Now You Try: Which number IS NOT divisible by 4? 564 4101 188 Need More Practice: Numbers Divisible by 4

  15. WONDERFUL

  16. The last 2 digits are divisible by 4.

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

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

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

  20. Wonderful

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

  22. Now You Try: Which number IS NOT divisible by 6? 8700 523 7602 Need more practice? Numbers Divisible by 6

  23. Way To Go!!

  24. This number is divisible by 2 and 3.

  25. 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

  26. Now You Try: Which number IS NOT divisible by 8? 1,4707,1201,590

  27. Way To Go!!

  28. NO

  29. 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 5445 5 + 4 + 4 + 5 =18 18 ÷ 9 =2

  30. Now You Try: Find the number that IS NOT divisible by 9. 9873 636 5541 Need More Practice: Numbers Divisible by 9 and 10

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

  32. Great Job!!!

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

  34. Now You Try: Find the number that ISNOT divisibleby ten. 56,920 7537 870

  35. The number ends in a ZERO.

  36. Way To Go!!

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

  38. Now that you have completed your two assignments, feel free to go to the following sites. THEY ARE SOOOOO MUCH FUN!!!!!!Fractionsvectorkids -divisibility rulesGamequarium Division Games

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