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you can use the ladder. But only with two numbers. If its more than 3 numbers you will have to factorize it, or list the prime #'s. (if you don't know what the ladder is, ask your math teacher. If your teacher doesn't know, ask a parent/gurdian, if they dont know than your left with the choice of googling it.)

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12y ago
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6y ago

You need at least two.

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the highest amount of each factor.

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

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11y ago

Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Combine the factors, eliminating duplicates.
2 x 3 x 5 x 7 = 210, the LCM

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11y ago

Example: 30 and 42
List the multiples.
30, 60, 90, 120, 150, 180, 210, 240
42, 84, 126, 168, 210, 252
The LCM is 210.

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Q: How do you do the list method for least common multiple?
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Their least common multiple is 28


How do you get the least common multiple of 25 and 10?

The least common factor of 10 and 25 is: 1. The HIGHEST common factor is 5, and the least common MULTIPLE is 50.


What lists factors is it called common factors or composite number or multiple?

When you are finding common factors, one method is to list the factors.


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the answer 63You just list all the multiples of each7 - 7, 14, 21, 28, 35, 42, 49, 54, 63, 70, ...63 - 63, 126, 189, 252, ...


What is the least common multiple of 7 28 42?

The traditional method is to list the multiples of each number and pick the smallest multiple they have in common. This can be very tasking for large numbers. The traditional solution is shown below: [Method 1] Steps: 1. List the multiples of each number: 28 - 28, 56, 84, 112, 140... 42 - 42, 84, 126, 168, 210... 2. Pick the smallest multiple they have in common which in this case is 84. If there are no common multiples, continue listing multiples until a common multiple is produced. [Method 2 - Prime factorization Method] Steps: 1. Find the prime factorization of each number. 28 - 2*2*7 42 - 2*3*7 2. Circle the prime factors they have in common one pair at a time. One pair of twos and one pair of sevens. The other 2 and 3 remain uncircled. 3. Multiply one number from each of the pairs by each of the uncircled prime factors remaining to get the LCM (least common multiple). 2*7*2*3 = 84

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How do you get the least common multiple of 25 and 10?

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