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Envision Math 2.0: Grade 6, Volume 1

EM

Envision Math 2.0: Grade 6, Volume 1 View details

2. Find Greatest Common Factor and Least Common Multiple

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Exercise 16 Page 128

The prime factorization of a composite number is the number written as a product of its prime factors.

Factor Tree:

Prime Factorization: 2* 3* 5

Practice makes perfect

Let's start by recalling the definition of two important terms.

Term	Definition	Examples
Prime Number	A number that has exactly two positive factors, 1 and itself.	3, 5, 13
Composite Number	A number that is not a prime number.	4, 12, 63

We want to write the prime factorization of 30. The prime factorization of a composite number is the number written as a product of its prime factors. We will use factor pairs and a factor tree to find the prime factorization of 30. The factor tree is complete when only prime factors appear in the product.

The prime factorization of 30 is 2* 3* 5.

Subchapter links

Do You Understand? p.127

Do You Know How? p.127

Assessment Practice p.130