This pdf contains the introduction of prime, composite, and factors. Prime numbers are the numbers that have only 2 factors i.e. 1 and itself. Composite numbers are the numbers that have at least 3 or more than 3 factors. Prime numbers can only be divided by 1 and themselves. Composite numbers can be divided by any other number including 1 and itself.
1.
Name: ____________________________________
Prime and Composite
Factors are the numbers you multiply to get another number.
Prime numbers are the numbers that have only two factors.
What are the factors of 3? 1 and 3
Because 3 has only two factors, it is a prime number.
Composite numbers are the numbers that have more than two factors.
What are the factors of 6? 1, 2, 3, and 6
Because 6 has more than two factors, it is a composite number.
Complete the table.
Number List of Factors Prime or composite?
10
5
12
18
41
15
2
49
73
33
21
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2.
ANSWER KEY
Prime and Composite
Factors are the numbers you multiply to get another number.
Prime numbers are the numbers that have only two factors.
What are the factors of 3? 1 and 3
Because 3 has only two factors, it is a prime number.
Composite numbers are the numbers that have more than two factors.
What are the factors of 6? 1, 2, 3, and 6
Because 6 has more than two factors, it is a composite number.
Complete the table.
Number List of Factors Prime or composite?
10 1, 2, 5, and 10 composite
5 1 and 5 prime
12 1, 2, 3, 4, 6, and 12 composite
18 1, 2, 3, 6, 9, and 18 composite
41 1 and 41 prime
15 1, 3, 5, and 15 composite
2 1 and 2 prime
49 1, 7, and 49 composite
73 1 and 73 prime
33 1, 3, 11, and 33 composite
21 1, 3, 7, and 21 composite
10 1, 2, 5, and10 composite
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