2. What is the GCF?
• The GCF is the biggest or highest number
that divides evenly into two or more
numbers.
3. What is the LCM?
• The LCM is the smallest number that is a
multiple of two or more numbers.
• Ex:
4. Step 1
• Write your numbers side
by side inside a long
letter L.
• Ex: 12 and 8
12 8
5. Step 2
• Find the smallest number
that will go into both
numbers evenly and put it
on the left of the long L.
12 82
6. Step 3
• Divide the number to the left into both
numbers and put the answers below
the original numbers. Repeat steps 2
and 3 until you can no longer divide.
12 82
2 6 4
3 2
7. Step 5
• Multiply all the numbers on the left of
the long L’s to find the GCF.
• Ex: 2 X 2 = 4
12 82
2 6 4
3 2
8. Step 4
• Multiply all the numbers on the left of the
long L’s and below the bottom long L to
find the LCM. (You should make an L)
• Ex: 2 X 2 X 3 X 2 = 24
12 82
2 6 4
3 2
The LCMis 24
