1. Students will be able to: Find the Least Common Multiple (LCM) of 2 whole numbers. Objective

2. Multiple • The product of a whole number and ANY other whole number. • A multiple of 4 is 8. 4 x 2 =8 so 8 is a multiple of 4.

3. Least Common Multiple (LCM) Smallest common multiple of 2 or more numbers.

4. LCM- Least Common Multiple Today we are learning how to find the Least Common Multiple (LCM) between a set of 2 numbers, because this will help us when we start adding and subtracting fractions. Let’s look at the numbers 3 and 4. 3: 3, 6, 9, 12, 15, 18 4: 4, 8, 12 , 16

5. On your whiteboards, find and circle the Least common multiple for 4 & 9! Try listing out the multiples for 4 starting with 4: 4, 8…. Now try listing out the multiples for 9 starting with 9: 9, 18…. Class Work

6. Keep going! Try listing out the multiples for 4 starting with 4: 4, 8, 12, 16, 20, 24, 28, 32, 36 Now try listing out the multiples for 9 starting with 9: 9, 18, 27, 36 Class Work

7. More Practice with LCMs 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30 4: 4, 8, 12, 16, 20, 24, 28, 32 We see that 24 is also a common multiple. A set of numbers might have several common multiples, but we are trying to find the Least common multiple. Therefore, even though 12 and 24 are common multiples – 12 is the least common multiple.

8. Now, you find the LCM! Your Turn…

9. 6, 10

10. 30

11. 4, 50

12. 100

13. 3, 5

14. 15

15. 9, 15

16. 45

17. 9, 6

18. 18