Divisibility Rules - Mrs....

divisibility rules.notebook

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September 14, 2017

Aug 30­1:40 PM

Divisibility RulesDivisibility rules make math much easier!! Did you ever wonder how people could tell if something was divisible by a number just by looking at it? Following the rules and know your times tables.

divisibility rules.notebook

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September 14, 2017

Aug 30­1:44 PM

A number is divisible by two if it is even. Another way to say it is even is if it ends in 0, 2, 4, 6 or 8

258 is divisible by two because it ends in 8, which makes it an even number.

Which numbers below are divisible by 2?

divisibility rules.notebook

3

September 14, 2017

Aug 30­1:53 PM

A number is divisible by three if the sum of the digits adds up to a multiple of three. (Remember, the sum of something means you are adding)531 is divisible by three because 5 + 3 + 1 = 9 and nine is a multiple of 3 (or is divisible by three), then 531 is divisible by three.

Which numbers are divisible by 3?

divisibility rules.notebook

4

September 14, 2017

Aug 30­2:02 PM

A number is divisible by 4 if it is even and can be divided by 2 twice.

128 is divisible by 4 because half of it is 64 and 64 is still divisible by 2 (even)

Can you tell which numbers are divisible by 4?

12 199 40

divisibility rules.notebook

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September 14, 2017

Aug 30­2:09 PM

A number is divisible by 5 if it ends in a 5 or a 0

Which numbers are divisible by 5?

divisibility rules.notebook

6

September 14, 2017

Aug 30­2:12 PM

A number is divisible by 6 if it is divisible by BOTH 2 and 3.

222 is divisible by 6 because it is even, so it is divisible by 2 and its digits add up to 6 which makes it divisible by 3

Can you tell which numbers are divisible by 6?

312 18 91

divisibility rules.notebook

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September 14, 2017

Aug 30­2:18 PM

A number is divisible by nine if the sum of the digits adds up to a multiple of nine. (This rule is similar to the rule for three)9243 is divisible by 9 because the sum of the digits adds up to eighteen, which is a multiple of nine.

So which numbers below are divisible by 9?

9 99 641 82

divisibility rules.notebook

8

September 14, 2017

Aug 30­2:24 PM

A number is divisible by 10 if it ends in a zero.

Which numbers are divisible by 10?

97,430 30,974 20 185

divisibility rules.notebook

9

September 14, 2017

Sep 16­3:02 PM

State whether each number is divisible by 2, 3, 5, 6, 9 or 10

234

divisibility rules.notebook

10

September 14, 2017

Sep 16­3:05 PM

State whether each number is divisible by 2, 3, 5, 6, 9 or 10

498

divisibility rules.notebook

11

September 14, 2017

Sep 16­3:05 PM

State whether each number is divisible by 2, 3, 5, 6, 9 or 10

87

divisibility rules.notebook

12

September 14, 2017

Sep 16­3:05 PM

State whether each number is divisible by 2, 3, 5, 6, 9 or 10

45

divisibility rules.notebook

13

September 14, 2017

Sep 16­3:05 PM

State whether each number is divisible by 2, 3, 5, 6, 9 or 10

2,019

divisibility rules.notebook

14

September 14, 2017

Sep 16­3:08 PM