Prime or Composite?
Factors or Multiples?
Objective: I can differentiate between prime and
composite numbers. I can differentiate between
factors and multiples.
Created by
Chris Garrison
Sycamore 5th grade
What are...
Composite Numbers?
Prime
Numbers?
have more
than two factors
have “exactly two factors”
1 and itself
Factors
are small
Multiples
are
Get Ready!
Let’s practice what we know!
Is this number prime or
composite? Show all work and
carefully find all the factors!
Composite!
Is this number prime or
composite? Show all work and
carefully find all the factors!
Composite!
Is this number prime or
composite? Show all work and
carefully find all the factors!
Prime!
Is this number prime or
composite? Show all work and
carefully find all the factors!
Composite!
Test for success!
Think smarter not harder!
Example
Which of following are all prime numbers?
X
X 13,
a. 2, 3, 5, 7, 9,
b. 1,X4, 5, 7, 11, 13,
X
c. 3, 5, 7, 13, 17, 19
Eliminate composite numbers first.
Then double check remaining numbers to make
sure they are all prime.
Is this number a factor or a
multiple of 9? Prove it!
Multiple
Is this number a factor or a
multiple of 36? Prove it!
Factor
Is this number a factor or a
multiple of 18? Prove it!
Factor
Is this number a factor or a
multiple of 7? Prove it!
Multiple
Is this number a factor or a
multiple of 24? Prove it!
Factor
Is this number a factor or a
multiple of 12? Prove it!
Multiple
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, 30
15: 1, 2, 3, 5, 15
GCF = 15
Least Common
Multiple
Least multiple that more than one number share.
1. List the first 5 multiples of each number.
2. Choose the smallest multiple they both share.
2: 2, 4, 6, 8, 10
3: 3, 6, 9, 12, 15
LCM: 6
Test for success!
Think smarter not harder!
Example
Which of following are the factors of 24?
a. 1, 2, 3, 4, 6, 8, 12, 24
Xb. 1, 4, 6, 5, 8, 12, 24,
Xc. 2, 3, 6, 8, 12, 24, 48
X
Double check all factors with...
Eliminate any answer choice
that includes a multiple.
Factor Rainbow
1, 2, 3, 4, 6, 8, 12, 24
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.