1. GCF – Greatest Common Factor 4-3
6.NS.4
I can find the greatest common factors of two whole numbers less than or equal to 100

2. LCM – Least Common Multiple
6.NS.4
I can fin the least common multiple of two numbers less than or equal to 12

3. Greatest Common Factor
What are we trying to find?
What are factors?
Can you write your own defintion?

4. Least Common Multiple What are we trying to find? What are multiples?
Can you write your own defintion?

5. The Greatest Common Factor (GCF) of 2 numbers is the largest factor the 2 numbers have in common.
Factors of 24:
Factors of 36:
Common factors: 1, 2, 3, 4, 6, 8,
12, 24 1, 2, 3, 4, 6, 9,
12,
18, 36
1, 2, 3, 4, 6, 12
The greatest common factor (GCF) of 24 and 36 is 12.

6. List the multiples and circle the smallest on they have in common
The Least Common Multiple (LCM) is the smallest number that is a multiple of two numbers.
List the multiples and circle the smallest on they have in common
4: 4, 8, 12 , 16, 20, 24, 28, 32, 36, 40, 44, …
5: 5, 10, 15, 20, 25, 30, 35, 40, 45, . . .

7. Find the GCF and LCM
9 , 12
GCF:
LCM:

8. Keep them Straight…… Focus on the key words: Multiple and Factors.
Least Common Multiple
Greatest Common Factor
Multiple:
Factors:

9. Find the Greatest Common Factor
3, 4
12, 18
9, 21

10. Find the Least Common Multiple
2, 10
5, 6
3, 12

11. How well can you find the LCM and GCF of two numbers?.
I don’t understand
I nearly understand
I fully understand 11

12. Watch and Learn…..
LCM Video
GCF Video