Finding GCF and LCM of Three Numbers

In this video, Mr. J explains how to find the greatest common factor (GCF) and the least common multiple (LCM) of three numbers. The process for finding the GCF involves listing the factors of each number and identifying the largest common factor. For the LCM, the video demonstrates listing multiples of each number and finding the smallest common multiple. Examples are provided for both concepts, and viewers are encouraged to practice for better understanding. Additional resources are mentioned for further learning.

What is the Greatest Common Factor (GCF)?

• The smallest multiple that two or more numbers share

• The largest factor that two or more numbers share

• The smallest factor that two or more numbers share

• The largest multiple that two or more numbers share

Which of the following is a factor of 27?

• 10

• 4

• 2

• 9

Tags

CCSS.4.OA.B.4

What are the factors of 9?

• 1, 2, 9

• 1, 3, 9

• 1, 2, 3, 9

• 1, 3, 6

Tags

CCSS.4.OA.B.4

Which of the following is NOT a factor of 18?

• 5

• 3

• 2

• 9

Tags

CCSS.4.OA.B.4

What is the Greatest Common Factor (GCF) of 27, 9, and 18?

• 9

• 27

• 1

• 3

What is a multiple?

• A number that divides another number evenly

• A number that is the result of multiplying a given number by an integer

• A number that is the result of subtracting a given number from itself

• A number that is the result of adding a given number to itself

Which of the following is a multiple of 5?

• 12

• 3

• 7

• 10

Tags

CCSS.4.OA.B.4

What are the first five multiples of 8?

• 8, 18, 28, 38, 48

• 8, 14, 20, 26, 32

• 8, 12, 16, 20, 24

• 8, 16, 24, 32, 40

Which of the following is NOT a multiple of 20?

• 40

• 60

• 80

• 90

Tags

CCSS.4.OA.B.4

What is the Least Common Multiple (LCM) of 5, 8, and 20?

• 40

• 20

• 60

• 80