CH.5 + Fractions EC Review

Why is prime factorization preferred for finding GCF and LCM of larger numbers?

• It is easier for smaller numbers.

• It is the only method available.

• It doesn't require any calculations.

• It is faster than listing all factors or multiples.

What is the first step in finding the GCF of 54, 36, and 90 using prime factorization?

• Divide the numbers by 2.

• List all multiples of the numbers.

• Find the prime factorization of each number.

• Add the numbers together.

Which of the following is a common prime factor of 54, 36, and 90?

• 7

• 5

• 11

• 2

How do you calculate the GCF once you have the common prime factors?

• Divide the common prime factors.

• Subtract the common prime factors.

• Multiply the common prime factors.

• Add the common prime factors.

What is the first step in finding the LCM of 21, 28, and 32 using prime factorization?

• List all factors of the numbers.

• Subtract the smallest number from the largest.

• Find the prime factorization of each number.

• Multiply the numbers together.

When matching prime factors vertically for LCM, what should you do if a number appears in multiple columns?

• Ignore the number.

• Bring down only one occurrence of the number.

• Add the numbers together.

• Bring down all occurrences of the number.

What is the result of multiplying the numbers brought down from each column when calculating the LCM?

• The sum of the numbers.

• The difference between the numbers.

• The least common multiple.

• The greatest common factor.

Which of the following is NOT a step in finding the LCM using prime factorization?

• Bringing down numbers to represent columns.

• Listing prime factors vertically.

• Multiplying the numbers brought down.

• Adding all the numbers together.

What is the LCM of 21, 28, and 32 as calculated in the video?

• 128

• 56

• 672

• 84

What is the purpose of using prime factorization for GCF and LCM?

• To make the process more complex.

• To simplify the process for larger numbers.

• To avoid using multiplication.

• To only work with even numbers.