Factor Pairs

​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

​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

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

Composite numbers:

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

Prime Numbers have only 2 factors!!

• 1

• itself

Composite numbers have more than two factors

Multiple Choice

Which numbers are the factors in this problem?

2x9=18

• 18 and 2

• 18 and 9

• 2 and 9

• 2, 9 and 18

Multiple Choice

What is a prime number?

• A number that has only two factors, 1 and itself.

• A number that can be divided equally by 1, itself and 2.

• A number that is odd.

• A number that cannot be divided equally by anything.

Multiple Choice

What is a composite number?

• A number that is odd

• A number that has only two factors

• A number that can be divided equally by more numbers than just 1 and itself.

• A number greater than 2.

Multiple Choice

Is the number 8 prime or composite?

• prime

• composite

Multiple Choice

Is the number 19 prime or composite?p

• prime

• composite

Multiple Choice

which of these numbers is prime?

• 2

• 4

• 6

• 8

Multiple Choice

Which of these numbers is composite?

• 2

• 11

• 13

• 10

Multiple Choice

Which of these numbers is composite?

• 12

• 5

• 11

• 17

Multiple Choice

Which number is missing in this list of factors for the number 12?

1, 2, 3, 4, 6

• 5

• 9

• 12

• 0

Multiple Choice

Identify the correct list of factors for the number 8

• 1, 2, 4, 8

• 1, 2, 8

• 2, 4, 8

• 1,2, 3, 4, 8

Multiple Choice

Is 3 a factor of 21?

• yes

• no

Composite Numbers

• Numbers with more than 2 factors.

• For example: What are the factors of 12?

• 12 and 1, 3 and 4, 2 and 6

• The factors of 12 are 1, 2, 3, 4, 6, and 12. Since it has more than two factors, then it is a composite number.

Prime Numbers

• Numbers that have only two factors.

• For example: What are the factors of 5? 5 and 1, since 5 has only two factors it is then a prime number.

Multiple Choice

Prime or Composite.

13

• Prime

• Composite

Multiple Choice

Prime or Composite.

54

• Prime

• Composite

Multiple Select

Which numbers are factors of 18?

• 9

• 5

• 6

• 12

• 2

Multiple Select

Which numbers below are multiples of 8?

• 26

• 18

• 32

• 4

• 16

Multiple Choice

Which of the following are multiples of 6?

• 2, 4, 6

• 1, 2, 3, 6

• 6, 12, 18, 24

• 6, 12, 24, 48

Multiple Choice

Which of the following is NOT a factor of 8?

• 2

• 4

• 1

• 6

Multiple Choice

Is 16 a multiple of 4?

• yes

• no

Multiple Choice

Is 4 a factor of 16?

• yes

• no

Multiple Choice

Is 30 a multiple of 5?

• yes

• no

Prime Numbers have only 2 factors!!

• 1

• itself

Composite numbers have more than two factors