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# How do you use the ladder meathod to find the GCF and the LCM of a number?

Updated: 10/19/2022

Wiki User

12y ago

You don't find the GCF and LCM of a single number, you need at least two. Ladders, trees, fireworks, rainbows... It's all the same thing, just different ways of writing the factors on the page. Find a way that works for you. To find the GCF and LCM of 30 and 42, you need to factor them.

30 42

15,2 21,2

5,3,2 7,3,2

2 x 3 x 5 = 30 and 2 x 3 x 7 = 42

To find the GCF, select the common factors.

2 x 3 = 6, the GCF.

To find the LCM, combine the factors, eliminating duplicates.

2 x 3 x 5 x 7 = 210, the LCM

Wiki User

12y ago

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Q: How do you use the ladder meathod to find the GCF and the LCM of a number?
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