gcf, lcm, prime factorization

GCF of 28 and 70

• 3
• 14
• 7
• 10

GCF of 24 and 56

• 2
• 4
• 6
• 8

GCF of 99 and 54

• 9
• 3
• 6
• 8

GCF of 20 and 35

• 4
• 5
• 7
• 20

Which is a factor of 15?

• 2
• 3
• 4
• 6

Which is a NOT a factor of 9?

• 0
• 1
• 3
• 9

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

What is the greatest common factor of 8 and 10?

• 1
• 3
• 4
• 2

Which of these is NOT a factor of 36?

• 2
• 8
• 12
• 6

What is the greatest common factor of 6 and 21?

• 6
• 2
• 3
• 7