Finding GCF and LCM Concepts

This video tutorial explains how to find the Lowest Common Multiple (LCM) and the Greatest Common Factor (GCF) of the numbers 12, 15, and 9. It begins with an introduction to the concepts of LCM and GCF, followed by detailed steps to create factor trees for each number to identify their prime factors. The video then demonstrates how to calculate the LCM by multiplying the highest power of all prime factors present in the numbers and the GCF by identifying the common prime factors. The tutorial concludes with a summary and a call to action for viewers to subscribe for more educational content.

What is the purpose of this video?

• To find the LCM and GCF of 12, 15, and 9

• To explain the concept of prime numbers

• To solve quadratic equations

• To demonstrate how to add fractions

What is the first step in creating a factor tree for the number 12?

• Divide 12 by 5

• Divide 12 by 6

• Divide 12 by 2

• Divide 12 by 3

Which of the following is a prime factor of 15?

• 4

• 6

• 2

• 5

How many times should a common prime factor be multiplied when calculating the LCM?

• Four times

• Once

• Twice

• Three times

What is the LCM of 12, 15, and 9?

• 180

• 240

• 120

• 90

Which number is a common prime factor of 12, 15, and 9?

• 7

• 2

• 3

• 5

What is the GCF of 12, 15, and 9?

• 4

• 3

• 2

• 1

What should you do after finding the prime factors to determine the GCF?

• Add them together

• Multiply them all

• Identify the common ones

• Divide them by 2

What does the video encourage viewers to do at the end?

• Watch another video

• Subscribe and share the video

• Read a math book

• Solve more math problems