Least Common Multiples & Greatest Common Factor Review

What is the least common multiple (LCM) of 8 and 5?

HINT: Start small and go bigger! Can you divide it by BOTH numbers?

• 50
• 40
• 5
• 8

What is the least common multiple (LCM) of 4 and 10?

HINT: Start small and go bigger! Can you divide it by BOTH numbers?

• 4
• 40
• 15
• 20

Find the GCF of 12 and 6. 

HINT: Start big and go smaller! Can it go into both numbers evenly?

• 1
• 6
• 2
• 3

GCF of 32 and 40

HINT: Start big and go smaller! Can it go into both numbers evenly?

• 2
• 4
• 6
• 8

Find the LCM of each set of numbers.  5, 10, 15 

HINT: Start small and go bigger! Can you divide it by BOTH numbers?

• 50
• 30
• 90
• 150

LCM (9, 12)

HINT: Start small and go bigger! Can you divide it by BOTH numbers?

• 9
• 36
• 12
• 3

GCF (25, 15)

HINT: Start big and go smaller! Can it go into both numbers evenly?

• 5
• 10
• 15
• 20

Sara had 16 red flowers and 24 yellow flowers.  She wants to make bouquets with the same number of each color flower in each bouquet.  What is the greatest number of bouquets that she can make?

HINT: Use the Greatest Common Factor!

• 4
• 2
• 48
• 8

Answer explanation

HINT: Groups mean factors!

Find the GCF (Greatest Common Factor) of 50 and 40.

HINT: Start big and go smaller! Can it go into both numbers evenly?

• 5

• 2

• 10

• 8

What is the least common multiple (LCM) of 6 and 8?

• 6
• 8
• 48
• 24