1. Finding The Least Common Multiple
NS. 4

2. What is a multiple?
Multiple- any of the products of a given number and another positive integer. What are the first 5 multiples of 20:

3. What is the Least Common Multiple or LCM?
LCM- the smallest whole number that is a multiple of two or more numbers.
There are 2 ways to find the LCM: 1. List Method 2. L - Method

4. List Method- I DO What is the LCM of 4 and 6?
List the first 10 multiples of each number.
CIRCLE the Common Multiples Put a RECTANGLE around the LCM

5. List Method- WE DO What is the LCM of 3 and 5?
List the first 10 multiples of each number.
CIRCLE the Common Multiples Put a RECTANGLE around the LCM

6. List Method- YOU DO List the first 10 multiples of each number.
What is the LCM of 12 and 18?
List the first 10 multiples of each number.
CIRCLE the Common Multiples Put a RECTANGLE around the LCM

7. Questions
Is it really necessary to write out 10 multiples of each number?
Should we start by writing the multiples of the larger or smaller of the two numbers? Which will lead us to find the LCM most effectively?

8. L - Method- I DO
What is the LCM of 9 and 12?

9. L - Method- WE DO
What is the LCM of 8 and 18?

10. L - Method- YOU DO
What is the LCM of 4 and 30?

11. Complete your practice problems

12. Exit Ticket
What is the LCM of 12 and 30?