Factors and Multiples Concepts

In this video, Mr. J explains how to find the greatest common factor (GCF) and the least common multiple (LCM) of three numbers. The video is divided into two main sections: finding the GCF and finding the LCM. For the GCF, Mr. J demonstrates how to list the factors of each number and identify the greatest one they share. For the LCM, he shows how to list the multiples of each number and find the smallest one they have in common. The video concludes with a reminder that multiples are infinite, and viewers can extend their lists to find more common multiples.

What is the greatest common factor (GCF) of the numbers 15, 25, and 30?

• 3

• 5

• 10

• 15

Tags

CCSS.4.OA.B.4

Which of the following is NOT a factor of 15?

• 7

• 5

• 3

• 1

Tags

CCSS.4.OA.B.4

Which of the following is a factor of 30?

• 8

• 11

• 7

• 10

Tags

CCSS.3.OA.A.1

What is the product of the factors 3 and 5?

• 8

• 10

• 15

• 20

Tags

CCSS.4.OA.B.4

Which number is a common factor of 15, 25, and 30?

• 2

• 3

• 4

• 5

What is the least common multiple (LCM) of the numbers 12, 15, and 30?

• 30

• 45

• 90

• 60

Tags

CCSS.4.OA.B.4

Which of the following is a multiple of 12?

• 24

• 50

• 18

• 35

What is the first multiple of 15?

• 45

• 60

• 30

• 15

What is the second multiple of 30?

• 30

• 60

• 90

• 120

How many common multiples do numbers have?

• 1

• 2

• Finite

• Infinite