1. Factor vs Multiple 24
Factors Multiples

2. Prime Factorization
Using factor tree or division method

3. Using prime factorization to get all factors
Use the prime factorization to get all the the factors of 24.

4. Common Factors

5. Greatest Common Factor Also known as GCF

6. GCF
You try

7. Common Multiples

8. Least Common Multiple or LCM
∙ 32

9. Let’s try a few more LCM of 28 and 140 126 = 2 • 3 • 3 • 7
140 = 2 • 2 • 5 • 7
Think: both 140 and 126 are factors of the LCM. Start with either factor:
126 (factors: a 2, two 3s, and a 7). From 140, we still need a 2 and a 5.
LCM = 126 • 2 • 5 = 1260.
Check: = 140 • 3 • 3 = 1260

10. Word Problem Example
Tara can run around the track in 5 minutes. Todd can run the same distance in 6 minutes, and Tony can do it in 8 minutes. If they start at the same time, when will they next meet at the starting line?

11. Find the LCM of 5, 6, and 8