Understanding Least Common Multiple (LCM)

In this video, Mr. J explains how to find the least common multiple (LCM) of three numbers, using the example of 5, 8, and 20. He describes multiples as results of multiplying a number by integers and suggests listing four or five multiples for each number to find common ones. The video demonstrates listing multiples and identifying the smallest shared multiple, which is the LCM. The LCM of 5, 8, and 20 is found to be 40. Mr. J concludes by offering additional resources for further learning.

What is the least common multiple (LCM) of two or more numbers?

• The largest number that is a factor of all the numbers

• The smallest number that is a factor of all the numbers

• The smallest number that is a multiple of all the numbers

• The largest number that is a multiple of all the numbers

How can you find the multiples of a number?

• By multiplying the number by integers

• By adding the number to itself repeatedly

• By subtracting the number from itself repeatedly

• By dividing the number by integers

What are the first five multiples of 5?

• 5, 10, 15, 20, 25

• 5, 15, 25, 35, 45

• 5, 12, 19, 26, 33

• 5, 9, 14, 18, 23

What is the next step if no common multiples are found in the initial lists?

• Stop the process

• List more multiples

• Divide the numbers by 2

• Multiply the numbers by 2

What are the first five multiples of 8?

• 8, 12, 16, 20, 24

• 8, 14, 20, 26, 32

• 8, 18, 28, 38, 48

• 8, 16, 24, 32, 40

What are the first five multiples of 20?

• 20, 45, 70, 95, 120

• 20, 25, 30, 35, 40

• 20, 40, 60, 80, 100

• 20, 30, 40, 50, 60

What is the least common multiple of 5, 8, and 20?

• 40

• 25

• 60

• 20

Why is it important to find the least common multiple?

• To find the largest number that is a multiple of all given numbers

• To find the smallest number that is a factor of all given numbers

• To find the smallest number that is a multiple of all given numbers

• To find the largest number that is a factor of all given numbers

What should you do if you need more examples of finding the LCM?

• Rewatch the video

• Look for additional resources in the description

• Try to solve it without help

• Ask a friend

What does LCM stand for?

• Least Common Measure

• Lowest Common Multiple

• Least Common Multiple

• Lowest Common Measure