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Divisibility Rules PracticePowerPoint Presentation

Divisibility Rules Practice

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### Divisibility Rules Practice

Johnson 2010

A number that is even is divisible by 2, 6, and 10 without a doubt.

iRespond Question

Multiple Choice

F

A.) True

B.) False

C.)

D.)

E.)

The Answer?

- True!
- A number that is divisible by 2, 6 and 10 is always even.
- Numbers that are divisible by 3,5 and 9 might be even sometimes but NOT ALWAYS!

Choose the correct rule: I am a number that is divisible by 3 because

iRespond Question

Multiple Choice

F

A.) The sum of my digits adds up to 3

B.) The sum of my digits is divisible by 3

C.) The sum of my digits is an odd number

D.) The last two digits are divisible by 3

E.)

The Answer? 3 because

- If you picked B, you are correct.
- In order for a number to be divisible by 3, the sum of it’s digit must be divisible by 3!

Which numbers am I divisible by? 3 because

6,381

iRespond Question

Multiple Response

F

A.) 2

B.) 3

C.) 9

D.) 4

E.)

Your Answer? 3 because

- Did you choose only one answer?
- There are actually two answers to this question! B and C!
- 6,381 is divisible by 3 and by 9.
- Add the digits of the number to get the sum.
- 6 + 3 + 8 + 1 = 18; 1 + 8 = 9
- 9 is divisible by 3 and 9!

Now it's time for a MYSTERY NUMBER! Can you guess what number I am?

Here are my clues:

- commom multiple of 3 and 5

- less than 150

- odd

- tens digit is even

iRespond Question

Multiple Choice

F

A.) 120

B.) 105

C.) 135

D.) 160

E.)

What is the correct answer? number I am?

- 105!
- 105 is a common multiple of 3 and 5
- 105 is less than 150
- 105 is an odd number
- 105 has an even digit in the tens place

Great Job! number I am?

- If you didn’t do so hot, you need to study your divisibilty rules!!
- Now we know how to use our IRespond remotes!

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