Greatest Common Factors and Prime Numbers

This video tutorial covers module 2 on factors and multiples, focusing on understanding and finding the greatest common factor (GCF). It explains what factors are, how to find them, and how to determine the GCF of two numbers. The tutorial includes examples, such as finding factors of 20 and solving a cookie box problem using GCF. It also discusses prime numbers and their GCF. The lesson concludes with a transition to the next topic on using the distributive property.

What is a factor of a number?

• A number that is subtracted from another number

• A number that is multiplied by itself

• A number that divides another number evenly

• A number that is added to another number

Which of the following is the greatest common factor of 12 and 6?

• 2

• 3

• 4

• 6

If a baker has 10 vanilla and 15 chocolate cookies, what is the greatest number of identical boxes he can make?

• 1

• 5

• 3

• 10

What is the greatest common factor of 24 and 32?

• 4

• 6

• 8

• 12

What is the greatest common factor of 36 and 45?

• 12

• 6

• 3

• 9

Which of the following numbers is not a factor of 45?

• 3

• 5

• 9

• 12

Which of the following pairs of numbers has a greatest common factor of 1?

• 24 and 32

• 21 and 22

• 12 and 18

• 36 and 45

Which of the following is a prime number?

• 9

• 4

• 6

• 7

What is the greatest common factor of 5 and 7?

• 7

• 5

• 0

• 1

What is the definition of a prime number?

• A number that is even

• A number with exactly two factors

• A number with more than two factors

• A number with only one factor