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Mastering Rules of Divisibility for Easy Math

Learn the rules of divisibility for numbers like 2, 3, 4, 5, 6, 7, and 9. Master techniques to quickly determine if a number is divisible easily in math. Practice step-by-step methods for systematic calculations.

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Mastering Rules of Divisibility for Easy Math

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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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