Mastering the Ladder Method for Finding LCM

What is the first step in using the ladder method to find the LCM of a set of numbers?

• Choose a factor that divides evenly into at least two of the numbers.

• Add all the numbers together.

• Divide each number by the smallest number.

• Multiply all the numbers together.

In the example with numbers 6, 8, and 10, what is the LCM found using the ladder method?

• 120

• 100

• 60

• 80

When finding the LCM of 12, 15, and 20, which factor is chosen first in the ladder method?

• 2

• 5

• 4

• 3

What is the LCM of 12, 15, and 20 as calculated using the ladder method?

• 60

• 75

• 45

• 30

In the example with numbers 7, 18, and 21, what is the final LCM obtained?

• 126

• 147

• 84

• 105