GCF and LCM Concepts Review

This video tutorial reviews the concepts of greatest common factor (GCF) and least common multiple (LCM). It provides step-by-step instructions on solving practice problems for both GCF and LCM, including examples with two and three numbers. The video encourages viewers to pause and attempt problems independently before reviewing the solutions, helping them identify areas of strength and improvement.

What should you do before watching the solutions in the video?

• Try the practice problems on your own

• Skip the practice problems

• Watch the solutions first

• Ask a friend for help

What is the first step in finding the GCF of 27 and 63?

• Divide both numbers by 3

• Divide both numbers by 5

• Divide both numbers by 7

• Divide both numbers by 2

What is the GCF of 54 and 12?

• 3

• 6

• 9

• 12

What is the LCM of 15 and 6?

• 45

• 30

• 15

• 60

What is the LCM of 18 and 15?

• 60

• 45

• 90

• 75

What is the GCF of 18, 30, and 27?

• 9

• 2

• 3

• 6

What is the GCF of 27, 63, and 54?

• 6

• 3

• 9

• 12

What is the LCM of 4, 24, and 21?

• 84

• 210

• 126

• 168

What is the LCM of 14, 15, and 18?

• 420

• 210

• 630

• 840

What is the LCM of 86, 68, and 20?

• 14620

• 4620

• 1720

• 2924