Finding GCF and LCM: Key Concepts and Techniques

In this video, Shawn Ian demonstrates an easy method to find the greatest common factor (GCF) and the least common multiple (LCM) of two numbers. The video includes two examples: one with the numbers 18 and 24, and another with 16 and 40. Each example involves breaking down the numbers into their prime factors, using a Venn diagram to identify common factors, and calculating the GCF and LCM. The video concludes with a summary and an invitation for viewers to ask questions or suggest future topics.

What is the main topic of the video?

• Understanding fractions

• Finding the square root of numbers

• Solving quadratic equations

• Finding the Greatest Common Factor and Least Common Multiple

What is the first step in finding the GCF and LCM of two numbers?

• Finding the prime factors of the numbers

• Subtracting the numbers

• Dividing the numbers

• Adding the numbers

What are the prime factors of 18?

• 3, 3, 3

• 2, 2, 3

• 2, 2, 2

• 2, 3, 3

What are the prime factors of 24?

• 2, 2, 2, 2

• 2, 2, 3, 3

• 2, 3, 3, 3

• 2, 2, 2, 3

In a Venn diagram, where do you place the common prime factors?

• In the right circle

• In the left circle

• Outside the circles

• In the intersection of the circles

Tags

CCSS.6.NS.C.7A

CCSS.6.NS.C.7B

What is the GCF of 18 and 24?

• 9

• 6

• 12

• 3

What is the LCM of 18 and 24?

• 72

• 36

• 48

• 54

What are the prime factors of 16?

• 2, 2, 2, 2

• 2, 2, 2, 3

• 2, 2, 3, 3

• 2, 3, 3, 3

What are the prime factors of 40?

• 2, 2, 2, 2

• 2, 2, 3, 5

• 2, 2, 2, 5

• 2, 3, 3, 5

What is the LCM of 16 and 40?

• 80

• 40

• 32

• 16