Factors, Prime and Composite Numbers

Factors, Prime and Composite Numbers

by Kalena Bennett

​Factors

​The factors of a number are numbers that can be multiplied together to get that number.

​

​For example, 3 and 4 are FACTORS of 12 because 3x4=12

Multiple Choice

Which pair of numbers are factors of 42?

• 4 and 10

• 6 and 7

• 3 and 12

• 6 and 8

Multiple Choice

Is 3 a factor of 21?

• yes

• no

Multiple Choice

Is 3 a factor of 26?

• yes

• no

​We can list factors as well!

​If I think of all of the ways I can make 12, I get

• ​1x12

• ​2x6

• ​3x4

​

​When I list all of the factors, I write all of the numbers from the factor pair in order. So the factors of 12 are:

​1,2,3,4,6,12

Multiple Choice

Find ALL FACTORS of 24

• 1, 2, 12, 24

• 1, 2, 8, 24

• 1, 2, 3, 4, 5, 6, 8, 12, 24

• 1, 2, 3, 4, 6, 8, 12, 24

Multiple Choice

Which lists all the factors of 15?

• 1, 7, 8, 15
• 1, 15
• 1, 3, 5, 15
• 3, 5, 15

​Prime Numbers

​Prime Numbers are numbers that ONLY HAVE 1 FACTOR PAIR.

​

​For example, 17 is a prime number because 1x17 is the only factor pair I can multiply to get 17.

​

​

Multiple Choice

13 is a prime number

• True

• False

Multiple Choice

2 is a prime number

• True

• False

Multiple Choice

25 is a prime number

• True

• False

​Composite Numbers

​Composite Numbers have MORE THAN ONE FACTOR PAIR! For example, 16 is composite because it has these factor pairs:

• 1x16

• 2x8

• 3x4

Multiple Choice

the only factors prime numbers have are:

• 0 and 1
• 0 and itself
• 1 and itself
• 1

Multiple Choice

Which list has only prime numbers?

• 2, 3, 4, 5
• 1, 5, 7, 9
• 2, 3, 5, 7
• 2, 4, 6, 8

Multiple Choice

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors

​On the next slide, play Number Ninja with prime numbers!

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