Prime Factorization GCF and LCM

Find the prime number.

• 10
• 9
• 7
• 4

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

What are the prime factors of 30? 

• 3, 2, 5 
• 1, 2, 3, 5, 6, 15, 30
• 3, 30
• 10, 3

Use a factor tree to find the prime factors of 48

• 4x2x6

• 4x2x2x3

• 3x2x2x2x2

• 12x4

What is the HCF of 99 and 54

• 9

• 3

• 6

• 8

Which list of numbers contains only common multiples of 4 and 12?

• 12, 16, 20, 24, 28
• 12, 24, 36, 48, 60
• 4, 8, 12, 16, 20
• 8, 12, 16, 20, 24

What is the HCF and LCM 9 and 15?

• 3 and 15

• 9 and 3

• 45 and 3

• 3 and 45

What is the LCM of 5 and 9?

• 45

• 40

• 20

• 50

Simplify 14/35 using HCF

• 3

• 2/5

• 5/2

• 7/17.5