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