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Divisibility Rules

Divisibility Rules. Mr. Mira. Dividing by 2. All even numbers are divisible by 2. Divisible by 2. 1. 16. 321. 67. 25. 2. 23. 12. 20. 102. 31. Dividing by 3. Add up all the digits in the number. Find out what the sum is. If the sum is divisible by 3, so is the number

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Divisibility Rules

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  1. Divisibility Rules Mr. Mira

  2. Dividing by 2 • All even numbers are divisible by 2

  3. Divisible by 2 1 16 321 67 25 2 23 12 20 102 31

  4. Dividing by 3 • Add up all the digits in the number. • Find out what the sum is. If the sum is divisible by 3, so is the number • For example: 12123 (1+2+1+2+3=9) 9 is divisible by 3, therefore 12123 is too!

  5. Divisible by 3 16 253 1 201 66 321 20 231 102 412,311 315

  6. Dividing by 4 • Are the last two digits in your number divisible by 4? • If so, the number is too! • For example: 358912 ends in 12 which is divisible by 4, thus so is 358912.

  7. Divisible by 4 6,732 216 16 25 67 320 102 12 20 23 348

  8. Dividing by 5 • Numbers ending in a 5 or a 0 are always divisible by 5.

  9. Divisible by 5 1 16 320 67 25 2 23 12 20 102 31

  10. Dividing by 6 • If the Number is divisible by 2 and 3 it is divisible by 6 also.

  11. Divisible by 6 16 253 1 201 66 321 20 231 102 412,311 315

  12. Dividing by 9 • Almost the same rule and dividing by 3. Add up all the digits in the number. • Find out what the sum is. If the sum is divisible by 9, so is the number. • For example: 43785 (4+3+7+8+5=27) 27 is divisible by 9, therefore 43785 is too!

  13. Divisible by 9 16 252 201 66 321 6,705 20 231 102 412,311 315

  14. Dividing by 10 • If the number ends in a 0, it is divisible by 10.

  15. Divisible by 10 16 253 201 66 320 1,340 20 231 102 412,360 315

  16. additional test

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