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Chapter 2

Chapter 2. Section 2.1 Divisibility Rules. Rule for 2. If the number ends with an even digit (like 2,4,6,8,0), then it is divisible by 2. Example: 1,354,90 8. Rule for 5. If the number ends with a digit of “5” or “0”, then the number is divisible by 5.

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Chapter 2

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  1. Chapter 2 Section 2.1 Divisibility Rules

  2. Rule for 2 • If the number ends with an even digit (like 2,4,6,8,0), then it is divisible by 2. • Example: 1,354,908

  3. Rule for 5 • If the number ends with a digit of “5” or “0”, then the number is divisible by 5. • Example: 3,627,905 8,394,410

  4. Rule for 10 • If the number ends in a “0” digit, Then the number is divisible by 10. Example: 750,230

  5. Rule for 3 • If you add up the digits of the number andthe total is divisible by 3, Then the original number is divisible by 3. Example: 1,248 = 1+2+4+8 =15. 15 is divisible by 3, therefore so is 1,248!

  6. Rule for 9 • If you add up the digits ofthe number and the total is divisible by 9, Then the original number is divisible by 9. Example: 6,543 = 6+5+4+3 =18. 18 is divisible by 9, therefore so is 6,543.

  7. Rule for 4 • If the last two digits in the number are divisible by 4, Then the original number is divisible by 4. Example: 358,912 12 is divisible by 4, therefore so is 358,912!

  8. Rule for 6 • If the number is divisible by 2 and 3, then it is also divisible by 6. Example: 8,346. 8,346 = last digit even (divisible by 2) 8,346 = 8+3+4+6 = 21 (divisible by 3) So also divisible by 6!

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