Finding G.C.F. and L.C.M. Using Prime Factorization and Venn Diagrams

What two mathematical concepts are being explained in the video?

• Addition and Subtraction

• Greatest Common Factor and Least Common Multiple

• Multiplication and Division

• Square Roots and Exponents

Tags

CCSS.6.EE.A.1

What is the prime factorization of 12?

• 2 x 2 x 3

• 2 x 2 x 2

• 3 x 3 x 2

• 2 x 5 x 3

Which of the following is a prime factor of 18?

• 5

• 4

• 3

• 6

Tags

CCSS.4.OA.B.4

What is the prime factorization of 30?

• 3 x 3 x 5

• 2 x 2 x 5

• 2 x 3 x 3

• 2 x 3 x 5

Where do you place the common prime factors in the Venn diagram?

• In the individual sections

• In a separate list

• In the center section

• Outside the Venn diagram

Which prime factors are common to 12, 18, and 30?

• 2 and 5

• 2 and 3

• 3 and 5

• 2 and 4

Tags

CCSS.4.OA.B.4

What is the greatest common factor (GCF) of 12, 18, and 30?

• 3

• 12

• 6

• 9

What is the first step in finding the least common multiple (LCM)?

• Drawing a Venn diagram

• Finding the prime factorization

• Multiplying all numbers

• Adding all numbers

How do you calculate the least common multiple (LCM) using the Venn diagram?

• Multiply only the numbers in the center

• Add all the numbers in the Venn diagram

• Multiply all the numbers in the Venn diagram

• Subtract the numbers in the individual sections

What is the least common multiple (LCM) of 12, 18, and 30?

• 180

• 120

• 90

• 60