Greatest Common Factors

Greatest Common Factors

GREATEST COMMON FACTOR

When you find all the factors of two or more numbers, and you find some factors that are the same ("common"), the largest of those common factors is the GREATEST COMMON FACTOR (GCF)

What is the GCF of 12 and 20?

The factors of 12: 1, 2, 3, 4, 6, 12

The factors of 20: 1, 2, 4, 5, 10, 20

Common Factors: 1, 2, and 4

GCF: 4

Multiple Choice

Factors of 4

• 4= 1,2

• 4= 1,2,3,4

• 4= 1,2,4

Multiple Choice

The common factors of 16 and 24 are....

• 2, 4 and 8

• 2, 4, 12, and 24

• 1, 2, 4 and 8

• 2, 4 and 8

Multiple Choice

The number 372 is divisible by....

• 2 and 6

• 2, 3 , 4 , 6

• 2, 3, 6 and 9

• 2 and 4

Multiple Choice

The GCF of 24, 36, and 72 is.....

• 12

• 18

• 36

• 24

Multiple Choice

What is the prime factorization of the number 60?

• 4 x 3 x 5

• 2 x 2 x 3 x 5

• 2 x 3 x 3 x 5

• 2 x 3 x 1 0

Multiple Choice

What are the factors of 24?

• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 3, 6, 8, 24
• 1, 2, 3, 4, 6
• 1, 24

Multiple Choice

What is the GCF of 7 and 18?

• 7
• 18
• 1
• 3

Multiple Choice

GCF of 15 and 35

• 15
• 3
• 7
• 5

Multiple Choice

GCF of 16 and 40

• 4
• 8
• 2
• 10

Multiple Choice

GCF of 99 and 54

• 9
• 3
• 6
• 8

Multiple Choice

Is 3 a factor of 12?

• yes
• no

Multiple Choice

Find the GCF of 14 & 22.

• 1
• 2
• 7
• 14

Multiple Choice

GCF of 15 and 35

• 15
• 3
• 7
• 5

Multiple Choice

GCF of 12 and 28

• 3
• 6
• 2
• 4

Multiple Choice

GCF of 16 and 18

• 4
• 2
• 6
• 8

Multiple Choice

What is a factor of 14

• 5
• 7
• 3
• 28

Multiple Choice

What does GCF mean?

• Great Cookie Fever

• Greatest Common Factor

• Greatest Common Multiple

• Greatest Compared Factor

Multiple Choice

Find the greatest common factor of 32 and 48

• 2
• 8
• 16
• 18

Multiple Choice

What is the greatest factor of 28 and 49?

• 1
• 2
• 7
• 12

Multiple Choice

What is the GCF of 24 and 30?

• 2
• 12
• 6
• 3

Multiple Choice

What is the GCF of 18 and 45?

• 3

• 12

• 9

• 6

Multiple Choice

The Greatest Common Factor of two prime numbers is

• 0
• 1
• There are no common factors.
• Themselves.

Multiple Choice

What are the factors of 25?

• 1, 2, 3, 5, 10, 15, 25
• 1, 5,  25
• 1, 25
• 1, 5

Multiple Choice

List all the factors of 12

• 1, 2, 3, 4, 6, 12
• 1, 2, 4, 12
• 1, 12
• 1, 2, 3, 4, 5, 6, 12

Multiple Choice

What are the factors of 24?

• 1, 2, 3, 4, 6, 8, 12, 24
• 1, 3, 6, 8, 24
• 1, 2, 3, 4, 6
• 1, 24

Multiple Choice

What are the factors of 25?

• 1, 2, 3, 5, 10, 15, 25
• 1, 5,  25
• 1, 25
• 1, 5

Multiple Choice

GCF of 10 and 50

• 10
• 2
• 5
• 50

Multiple Choice

What is the GCF of 20 and 30?

• 5
• 2
• 10
• 20

Multiple Choice

What is the GCF of 36 and 24?

• 6

• 12

• 8

• 9

Multiple Choice

GCF of 18 and 24

• 2
• 3
• 4
• 6

Multiple Choice

GCF of 50 and 100

• 10
• 25
• 50
• 5

Multiple Choice

GCF of 16 and 18

• 4
• 2
• 6
• 8

Multiple Choice

GCF of 32 and 40

• 2
• 4
• 6
• 8

Multiple Choice

GCF 15 and 36

• 8

• 6

• 3

• 4

Multiple Choice

What is the greatest common factor of 8 and 10?

• 1
• 3
• 4
• 2

Multiple Choice

What is the greatest common factor of 16 and 24? 

• 6
• 2
• 4
• 8

Multiple Choice

What is the greatest common factor of 4 and 16?

• 4
• 2
• 1
• 16

Multiple Choice

What is the greatest common factor of 8 and 10?

• 1
• 3
• 4
• 2

Multiple Choice

Which is a factor of 15?

• 2
• 3
• 4
• 6

Multiple Choice

What are the factors of 16 and 24?

• 16-1, 3, 6, 12, 16
  24-1, 2, 4, 6, 24
• 16-1, 2, 4, 8, 16
  24-1, 2, 3, 4, 6, 8, 12, 24
• 16-16, 32, 48, 54
  24-24, 48, 72, 86
• 16- 1, 2, 16
  24-1, 2, 12, 24

Multiple Choice

What is the greatest common factor of 10 and 25?

• 5

• 1

• 10

• ₁

Multiple Choice

What is the greatest common factor of 10 and 25?

• 5

• 1

• 10

• ₁