Finding the Least Common Multiple

This video tutorial explains how to find the Least Common Multiple (LCM) of 32 and 40 using prime factorization and a factor tree. It begins with an introduction to the concept of LCM, followed by a step-by-step process of finding the prime factors of 32 and 40. A chart is created to organize these prime factors, and the video demonstrates how to use them to calculate the LCM. The tutorial concludes with a summary and a call to action for viewers to subscribe for more math and science videos.

What does LCM stand for?

• Least Common Multiple

• Lowest Common Multiple

• Lowest Common Measure

• Least Common Measure

Tags

CCSS.4.OA.B.4

Which of the following is a prime factor of 32?

• 3

• 4

• 5

• 2

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CCSS.5.NBT.B.6

CCSS.6.NS.B.2

How many times does the number 2 appear as a prime factor of 32?

• 3 times

• 4 times

• 5 times

• 6 times

Tags

CCSS.4.OA.B.4

Which of the following is a prime factor of 40?

• 7

• 6

• 5

• 3

How many times does the number 2 appear as a prime factor of 40?

• 2 times

• 3 times

• 4 times

• 5 times

What is the rule for using prime factors in finding the LCM?

• Use the lowest power of each factor

• Use the highest power of each factor

• Use each factor once

• Use each factor twice

How many 2s are used in the LCM calculation of 32 and 40?

• 3

• 4

• 5

• 6

What is the final step in calculating the LCM?

• Dividing the selected prime factors

• Adding the prime factors

• Subtracting the prime factors

• Multiplying the selected prime factors

What is the LCM of 32 and 40?

• 180

• 120

• 140

• 160

Which of the following is NOT a step in finding the LCM?

• Finding prime factors

• Creating a chart

• Adding the factors

• Applying rules for LCM