# Prime Factors using upside-down method or repeated division

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Videos, worksheets, and solutions to help Grade 6 students learn prime factorization using upside-down method or repeated division.

What is Prime Factorization?
Prime Factorization involves finding the set of prime numbers which when multiplied together will give us the original number.

What are some methods used for Prime Factorization?
We can use the factor tree method or the repeated division method.

Why we use Prime Factorization?
We can use Prime Factorization to help us find the Greatest Common Factor(GCF) or Least Common Multiple(LCM) of a number.

Prime Factorization using repeated division
This video shows how to use prime factorization to turn composite numbers into prime numbers using upside down division.

Prime Factorization with Upside Down Division
Example:
Find the prime factors of 210
Learn about prime factorization using repeated division.
Example:
Find the prime factors of
a) 6
b) 24
c) 35
d) 51
Using upside down birthday cake to find the greatest common factor (GCF)
This is an alternate way to determine the greatest common factor (GCF) for a set of numbers using the upside down birthday cake method.
Example:
Find the GCF of 12 and 42
Find the GCF of 32 and 96
Find the GCF of 196 and 260
Finding the LCM using Prime Factorization
Example:
Find the LCM of 28, 30, 35
Find the LCM of 14, 20, 30, 21

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