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RULES OF DIVISIBILITY

RULES OF DIVISIBILITY. Your name. DIVIDING by 2. All even numbers are divisible by 2. 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. Dividing by 4. Are the last two digits in your number divisible by 4?

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RULES OF DIVISIBILITY

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  1. RULES OF DIVISIBILITY Your name

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

  3. 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

  4. Dividing by 4 • Are the last two digits in your number divisible by 4? • If so, the number is too!

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

  6. Dividing by 6 • If the number is divisible by 2 and 3, it is also divisible by 6.

  7. Dividing by 7 (2 tests) • Take the last digit in a number. • Double and subtract the last digit in your number from the rest of the digits. • Repeat the process for larger numbers.

  8. Next Test for 7 • Take the number and multiply each digit beginning on the right hand side (ones) by 1, 3, 2, 6, 4, 5. Repeat the sequence as necessary. • Add the products. • If the sum is divisible by 7- so is the number.

  9. Dividing by 9 • If the sum of the digits is divisible by 9, then the number is divisible by 9.

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