1. GCF (greatest common factor) & LCM (least common multiple) http://www

2. GCF Greatest Common Factor

3. FACTOR
A whole number that divides another whole number with a remainder of 0.
EXAMPLE
Find the factors of 30.

4. Find the factors of 24 and 60.

5. GREATEST COMMON FACTOR (GCF)
The greatest number that is a factor of all the numbers.

6. Find the GCF of 42 and 36.

7. Find the GCF of 24 and 36.

8. Find the GCF of 142 and 136.

9. Find the GCF of 240, 36 and 144.

10. LEAST COMMON MULTIPLE (LCM)

11. MULTIPLE The product of that number and any nonzero whole number.
example
Find the multiples of 5.
Find the multiples of 8.

12. Find the LCM of each pair of numbers.
LEAST COMMON MULTIPLE
The least multiple that is common to all of the numbers.
example
Find the LCM of each pair of numbers.
4, 10
12, 15

13. Find the LCM 5, 7

14. Find the LCM 6, 30, 40

15. Find the LCM 4, 15, 40