Understanding LCM through Prime Factorization

This video tutorial explains how to find the least common multiple (LCM) of the numbers 6 and 9 using a factor tree method. It begins with identifying the prime factors of each number, then organizing them in a chart to minimize errors. The tutorial demonstrates how to bring down the necessary prime numbers and multiply them to find the LCM, which is 18. The video concludes with a call to action to subscribe for more math and science content.

What is the purpose of using a factor tree in finding the LCM?

• To add the numbers together

• To find the prime factors of the numbers

• To multiply the numbers directly

• To divide the numbers by 2

Which of the following is a prime factor of 6?

• 8

• 4

• 5

• 2

What are the prime factors of 9?

• 6 and 3

• 2 and 3

• 3 and 3

• 1 and 9

Why is a chart used in the process of finding the LCM?

• To cut down the number of errors

• To multiply the numbers

• To add the numbers

• To divide the numbers

When organizing prime factors, what rule is followed for the LCM?

• Bring down all numbers

• Bring down only one of each prime number

• Bring down the largest number

• Bring down the smallest number

What is the result of multiplying the prime numbers 2, 3, and 3?

• 6

• 9

• 18

• 12

What is the LCM of 6 and 9?

• 12

• 15

• 18

• 21