1. Fill in the chart above.
X 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X 9
2
3
2. Learning Target:
Students will learn how to find the
least common multiple (LCM) of two or
more numbers and they will learn the
different strategies for doing so.
3. These are the multiples of 2 and 3.
(always start by multiplying by 1)
The first three common multiples
are 6, 12, 18.
The least common multiple
(LCM) is 6.
X 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8 X 9
2 2 4 6 8 10 12 14 16 18
3 3 6 9 12 15 18 21 24 27
6. Methods of finding the LCM
1. List the multiples of each number
2. Prime Factorization
- Factor Tree
3. Lemon CAKE
7. Find the LCM of 3, 5.
1. List the multiples of each number
(do two multiples at a time)
3: 3, 6, 9, 12, 15
5: 5, 10, 15, 20
LCM: 15
8. Find the LCM of 8, 10.
2. Prime Factorization
- Factor Tree
Prime factorization of
8: 2, 2, 2
10:2, 5
LCM: 2 x 2 x 2 x 5 = 40
9. Find the LCM of 50, 90.
3. Lemon CAKE
2 50 90
5 25 45
5 9 = 450
LCM: 2 x 5 x 5 x 9 = 450
10. Lemon CAKE method
you do the same steps as the CAKE
method except that you multiply the
left side and the bottom side of the
cake (which makes a L shape) to find
the LCM.