Understanding GCF and LCM through Prime Factorization
Interactive Video
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Sophia Harris
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Mathematics
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5th - 8th Grade
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7 plays
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Hard
13:31
10 questions
Show answers
1.
Multiple Choice
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.
2.
Multiple Choice
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.
3.
Multiple Choice
Which of the following is a common prime factor of 54, 36, and 90?
7
5
11
2
4.
Multiple Choice
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.
5.
Multiple Choice
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.
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