Factors and Greatest Common Factor

In this video, Mr. J explains how to find the greatest common factor (GCF) of three numbers: 15, 25, and 30. The video is part two of a series, and viewers are encouraged to watch part one first. Mr. J demonstrates how to list the factors of each number and then identify the common factors. The greatest common factor is determined to be 5. The video provides a step-by-step guide to understanding factors and finding the GCF using multiplication and division strategies.

What is the main topic covered in this video?

• Solving quadratic equations

• Finding the greatest common factor

• Understanding prime numbers

• Finding the least common multiple

Which of the following is a factor of 15?

• 7

• 5

• 4

• 2

What is the product of the two factors of 15 that are not 1 or 15?

• 15

• 12

• 10

• 20

Which number is a factor of 25?

• 3

• 5

• 9

• 7

How many times should the factor 5 be listed for the number 25?

• Twice

• Once

• Not at all

• Three times

Which pair of numbers are factors of 30?

• 4 and 8

• 5 and 6

• 11 and 13

• 7 and 9

What is the product of the factors 5 and 6?

• 25

• 40

• 30

• 35

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

• 2

• 7

• 3

• 5

What is the greatest common factor of 15, 25, and 30?

• 1

• 3

• 10

• 5

Which of the following is NOT a factor of 30?

• 2

• 3

• 4

• 5