Prime or Composite?Factors or Multiples?

Objective: I can differentiate between prime and composite numbers. I can differentiate

between factors and multiples. Created byChris Garrison

Sycamore 5th grade

What are...

Prime Numbers?have “exactly two factors”

1 and itself

Composite Numbers?have more than two factors

Multiples

are BIG!Factors

are small

Let’s practice what we know!

Get Ready!

Is this number prime or composite? Show all work and

carefully find all the factors!

16Composite!

Is this number prime or composite? Show all work and

carefully find all the factors!

24Composite!

Is this number prime or composite? Show all work and

carefully find all the factors!

17Prime!

Is this number prime or composite? Show all work and

carefully find all the factors!

64Composite!

Test for success!Think smarter not harder!

Which of following are all prime numbers?a. 2, 3, 5, 7, 9, 13, b. 1, 4, 5, 7, 11,

13, c. 3, 5, 7, 13, 17, 19

Example

TipEliminate composite numbers first.

XX

Then double check remaining numbers to make sure they are all prime.

XX

Is this number a factor or a

multiple of 9? Prove it!

27Multiple

Is this number a factor or a

multiple of 36? Prove it!

12Factor

Is this number a factor or a

multiple of 18? Prove it!

6Factor

Is this number a factor or a

multiple of 7? Prove it!

49Multiple

Is this number a factor or a

multiple of 24? Prove it!

8Factor

Is this number a factor or a

multiple of 12? Prove it!

96Multiple

Greatest Common Factor (GCF)

The greatest factor two numbers share.

1. List the factors for each number.2. Circle common factors.

3. Choose the greatest factor.

30: 1, 2, 3, 5, 6, 10, 15, 3015: 1, 2, 3, 5, 15 GCF = 15

Least Common Multiple

Least multiple that more than one number share.

2: 2, 4, 6, 8, 103: 3, 6, 9, 12, 15

LCM: 6

1. List the first 5 multiples of each number.2. Choose the smallest multiple they both share.

1, 2, 3, 4, 6, 8, 12, 24

Test for success!Think smarter not harder!

Example Which of following are the factors of 24?

c. 2, 3, 6, 8, 12, 24, 48

b. 1, 4, 6, 5, 8, 12, 24,

a. 1, 2, 3, 4, 6, 8, 12, 24

TipsDouble check all factors with...

Factor Rainbow

Eliminate any answer choice that includes a

multiple.

XXX

Closure

Turn to your shoulder partner and tell them

the difference between a factor and multiple.

Now tell them the difference between prime and composite number.