Divisibility Rules. Divisibility What is Divisibility ? Divisibility means that after dividing, there will be NO remainder.

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Presentation transcript:

Divisibility Rules

Divisibility What is Divisibility ? Divisibility means that after dividing, there will be NO remainder.

356,821 Can you tell by just looking at this number if it is divisible by 2? by 5? by 10? by 3 ? by 9? By 6? The divisibility rules can help YOU !!!

Divisibility Rules Divisibility Rules help you learn shortcuts to tell when a number can be divided by another number with NO remainder.

Divisibility by 2 A number is divisible by 2 if the number is even. 18 ÷ 2 = 9 22 ÷ 2 = 11 (Notice that both of these numbers are even.) 21 ÷ 2 = 10 R1 (Not an even number.)

by 2? Are these numbers divisible by 2? 127 ( Not an even number) 937 ( Not an even number) 4678

Divisibility by 5 A number is divisible by 5 if it ends in 0 or ÷ 5 = 5 23 ÷ 5 = 4 R3

Divisibility by A number is divisible by 10 if it ends in ÷ 10 = ÷ 10 = ÷ 10 = 6 R7 784 ÷ 10 =78 R4

Divisibility By:

Divisibility by 3 A number is divisible by 3 if the sum of the digits is divisible by 3. Is the number 135 divisible by 3? Add the digits: = 9 Yes, 135 is divisible by 3 because the sum of the digits is divisible by 3.

Divisibility by A number is divisible by 9 if the sum of its digits is divisible by is divisible by 9 because = = 9 AND 9 is divisible by 9.

Divisibility by 6 A number is divisible by 6 if it is divisible by both 2 and 3. Is 42 divisible by 6? Even number = 6 6is divisible by 3 Is 51 divisible by 6? Not an even number

After All…DIVISIBILITY Rules!!

The End !! Divisibility is Un-frog-getable !!

To help you remember the RULES for 3 & 9