LCM and GCF of 9 and 15

The video tutorial explains how to find the lowest common multiple (LCM) and greatest common factor (GCF) of the numbers 9 and 15 using a factor tree method. It demonstrates organizing prime factors in a chart to simplify the calculation process. The LCM is calculated by multiplying the highest power of all prime factors, while the GCF is determined by identifying common prime factors. The tutorial concludes with a summary of the results: LCM equals 45 and GCF equals 3.

What do the terms LCM and GCF stand for?

• Lowest Common Multiple and Greatest Common Fraction

• Least Common Multiple and Greatest Common Factor

• Least Common Multiple and Greatest Common Fraction

• Lowest Common Multiple and Greatest Common Factor

What is the prime factorization of 9?

• 5 x 1

• 3 x 5

• 2 x 4

• 3 x 3

Which numbers are the prime factors of 15?

• 2 and 7

• 3 and 5

• 5 and 6

• 3 and 9

Why is a chart used in finding the LCM?

• To make the process more complicated

• To skip unnecessary steps

• To keep the factors organized

• To avoid using prime numbers

How do you determine the LCM from the chart?

• Add all the numbers together

• Multiply all the numbers together

• Bring down each number only once

• Bring down each number twice

What is the LCM of 9 and 15?

• 75

• 45

• 60

• 30

What rule is followed to find the GCF using the chart?

• Add all numbers in the column

• Multiply all numbers in the column

• Look for pairs in the column

• Skip all numbers in the column

What is the GCF of 9 and 15?

• 1

• 5

• 2

• 3

Which number is not a factor of both 9 and 15?

• 15

• 9

• 5

• 3

What is the final result for the LCM and GCF of 9 and 15?

• LCM is 45, GCF is 3

• LCM is 75, GCF is 1

• LCM is 30, GCF is 5

• LCM is 60, GCF is 2