GCF&LCM Practice

Find the GCF of 64 and 144.
Hint-Remember to use your factor trees to help you.

• 8

• 6

• 16

• 2

Tags

CCSS.6.NS.B.4

Using a Factor Tree, find the prime factorization of 48 in expanded form. 

• 2 x 12 x 12

• 2 x 2 x 2 x 2 x 3 x 3 x 5

• 2 x 2 x 2 x 2 x 3

• 7 x 7 x 7 

GCF of 27 and 70

• 3

• 5

• 7

• 10

Which pair of numbers has a GCF of 5?

• 10 and 25

• 30 and 40

• 45 and 9

• 50 and 25

Which of these is NOT a factor of 20?

• 2

• 4

• 6

• 20

Tags

CCSS.4.OA.B.4

Prime numbers have:

• Exactly 2 factors

• 2 pairs of factors

• More than 2 factors

• 1 factor

Find the GCF of the pair of numbers: 60 and 72

• 12

• 6

• 2

• 18

What is the GCF of 72 and 60?

• 8

• 2

• 12

• 1

Which list has only prime numbers?

• 2, 3, 4, 5

• 1, 5, 7, 9

• 2, 3, 5, 7

• 2, 4, 6, 8

2 x 2 x 2 is the prime factorization of

• 6

• 12

• 22

• 8