greatest common factor Lesson

4 Slides • 3 Questions

1

Greatest Common Factor (GCF) Review

2

GCF Review

Step 1: List the prime factors of each number using factor trees

Step 2: Identify the prime factors that both numbers have in common.

Step 3: Multiply the common factors together

Step 4: The product is the GCF. If there are no common prime factors the GCF is 1

3

List the factors

List the factors for each number, starting with 1 and the number itself. Then arrange the numbers in order from least to greatest.

4

Practice finding the GCF for the following.

5

Multiple Choice

Find the GCF for 12 & 22

1

12

2

3

22

4

11

6

Multiple Choice

Find the GCF of 45 & 27

1

9

2

12

3

45

4

1

7

Multiple Choice

Find the GCF of 36 & 42

1

9

2

8

3

6

4

12

Greatest Common Factor (GCF) Review

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