# Prime And Composite Numbers Worksheet

Chapter 14, Lesson 3
Reteach
Name
Date
Prime and Composite Numbers
CA Standards
NS 4.2, NS 4.1
You will ﬁ nd the factors of a prime number and the factors of a
composite number.
1
3
Step
To determine if 6 is prime or
Step
To determine if a number is
prime or composite, you can use counters
composite, use counters.
to make arrays or you can use divisibility
rules.
2
With 6 counters, you can make several
Step
To determine if 5 is prime or
arrays. 6 is a composite number because it
composite, use counters.
has more than 2 factors. These factors are
1, 2, 3 and 6.
With 5 counters, you can make only one
1 × 6 = 6
array. 5 is a prime number because it has
only two factors. These factors are 1 and 5.
2 × 3 = 6
1 × 5 = 5
In the table below, list the factors for each number. Use counters if you wish.
Tell if the number is prime or composite.
Number
Factors
Prime or Composite
13
1.
20
2.
31
3.
15
4.
Writing Math
Explain how you could use divisibility rules to
determine if 39 is prime or composite.
Reteach
Use with text pages 306–307.
Houghton Mifflin Company. .