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GCF and LCM. The Ladder Method. Step 1: Write your numbers side by side inside a letter L Ex.) 12 and 8. 128. Step 2:Find the smallest number that will go into both numbers evenly and put it on the left of the L. 2. 128. - PowerPoint PPT Presentation
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GCF and LCM
The Ladder Method
• Step 1: Write your numbers side by side inside a letter L
» Ex.) 12 and 8
12 8
• Step 2: Find the smallest number that will go into both numbers evenly and put it on the left of the L
2 12 8
• Step 3: Divide the number to the left into both numbers and put the answers underneath. Repeat steps 2 and 3 until you can no longer divide.
2 12 8
6 4
• Step 4: Repeat steps 2 and 3 until you can no longer divide.
2 12 8
6 4
3 2
2
• Step 5: Multiply all the numbers on the left of the L’s to find the GCF. 2 X 2 = 4
• The GCF is 4
2 12 8
6 4
3 2
2
• Step 6: Multiply all the numbers on the left of the L’s and below the last L to find the LCM. 2 X 2 X 3 X 2 = 24
• The LCM is 24
2 12 8
6 4
3 2
2
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