GCF & LCM Practice

What is the GCF of 18 and 24?

• 3

• 6

• 8

• 9

Find the LCM (Least Common Multiple) of 18 and 24.

• 6

• 72

• 24

• 5

Which number is not a factor of 24?

• 6
• 8
• 3
• 14

What is the GCF of 20 and 30?

• 5
• 2
• 10
• 20

Peter has 18 oranges and 27 pears. He wants to make fruit baskets with the same number of each fruit in each basket. What is the greatest number of fruit baskets he can make?

• 1
• 2
• 3
• 4

There are 48 girls and 64 boys. 
The choir teacher plans to arrange the students in equal rows.
Only girls or boys will be in each row (no mixing of girls and boys in the same row). What is the greatest number of students that could be in each row?

• 8
• 6
• 16
• 12

GCF of: 
14 and 20

• 7
• 28
• 2
• 6

What is the least common multiple (LCM) of 2 and 3?

• 6
• 8
• 20
• 10

GCF of 5 and 35

• 7

• 5

• 2

• 35

What is the greatest common factor of 10 and 4?

• 40

• 20

• 2

• 4