Understanding LCM and GCF

This video tutorial explains how to find the least common multiple (LCM) and greatest common factor (GCF) of the numbers 3, 7, and 8 using factor trees. It begins with an introduction to the concepts of LCM and GCF, followed by a detailed explanation of how to factor the numbers using a factor tree. The video then demonstrates how to create a factor chart and use it to calculate the LCM by multiplying all factors together, and the GCF by identifying common factors. The tutorial concludes with a summary of the results and a call to action for viewers to subscribe for more educational content.

What does LCM stand for?

• Largest Common Multiple

• Lowest Common Multiplier

• Least Common Multiple

• Lowest Common Measure

Tags

CCSS.4.OA.B.4

Which of the following numbers is a prime number?

• 6

• 4

• 8

• 3

Tags

CCSS.4.OA.B.4

What is the factor tree of 8?

• 2 x 2 x 2

• 2 x 4

• 3 x 3

• 4 x 2

Tags

CCSS.4.OA.B.4

What is the factor of 7?

• 3

• 1

• 14

• 7

How do you find the LCM of multiple numbers?

• Add all the numbers

• Multiply all the factors together

• Divide the largest number by the smallest

• Subtract the smallest number from the largest

What is the LCM of 3, 7, and 8?

• 24

• 168

• 84

• 56

Tags

CCSS.4.NBT.B.6

What is the result when you multiply 3, 2, 2, 2, and 7?

• 56

• 168

• 112

• 84

What condition must be met to find the GCF?

• At least two numbers must be the same

• All numbers must be prime

• At least three numbers must be the same

• All numbers must be different

What is the GCF of 3, 7, and 8?

• 3

• 2

• 7

• 1

If there are no common factors, what is the GCF?

• 0

• 1

• The smallest number

• The largest number