Finding Least Common Multiple Concepts

The video tutorial explains how to find the least common multiple (LCM) of 9 and 12 using a factor tree method. It begins with the prime factorization of each number, followed by setting up a prime factor chart to minimize errors. The tutorial then demonstrates how to calculate the LCM by multiplying the prime factors. The video concludes with a call to action to subscribe for more math and science content.

What is the purpose of finding the least common multiple (LCM) in mathematics?

• To determine the average of two numbers.

• To calculate the difference between two numbers.

• To find the smallest number that is a multiple of two or more numbers.

• To find the largest number that divides two or more numbers.

Tags

CCSS.4.OA.B.4

Which of the following is a prime factor of 9?

• 5

• 6

• 3

• 2

What is the prime factorization of 12?

• 2 x 2 x 2

• 2 x 3

• 3 x 3

• 2 x 2 x 3

Why is a prime factor chart useful when finding the LCM?

• It finds the greatest common divisor.

• It helps in adding numbers quickly.

• It reduces the chance of errors by organizing prime factors.

• It multiplies numbers automatically.

Tags

CCSS.4.OA.B.4

When setting up the prime factor chart, what should you do if you have a vertical pair of the same number?

• Multiply the pair.

• Bring down only one number.

• Ignore the pair.

• Bring down both numbers.

What is the next step after organizing the prime factors in the chart?

• Divide the numbers.

• Add the numbers together.

• Subtract the numbers.

• Multiply the numbers together.

What is the least common multiple (LCM) of 9 and 12?

• 18

• 24

• 36

• 48

What is the final step in finding the LCM of two numbers using the prime factor method?

• Divide the prime factors.

• Subtract the prime factors.

• Multiply the prime factors together.

• Add all the prime factors.