Section 1
Defining Factors and Factor Pairs
Property
Factors are numbers that are multiplied together to get a product.
If , then and are factors of .
The set is called a factor pair of .
This Grade 4 Eureka Math lesson introduces students to finding factor pairs for numbers up to 100 using arrays and area models, then builds on that understanding to define prime and composite numbers. Students practice identifying all factor pairs of a given number by systematically connecting pairs such as 1 and 18, 2 and 9, and 3 and 6, learning to confirm when they have found every pair. The lesson is part of Chapter 14: Reasoning with Divisibility and connects multiplication fluency to foundational number theory concepts.
Section 1
Defining Factors and Factor Pairs
Factors are numbers that are multiplied together to get a product.
If , then and are factors of .
The set is called a factor pair of .
Section 2
Defining Prime and Composite Numbers
A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself.
A composite number is a whole number that has more than two factors.
The number 1 is a special case and is neither prime nor composite because it has only one factor.
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Section 1
Defining Factors and Factor Pairs
Factors are numbers that are multiplied together to get a product.
If , then and are factors of .
The set is called a factor pair of .
Section 2
Defining Prime and Composite Numbers
A prime number is a whole number greater than 1 that has exactly two factors: 1 and itself.
A composite number is a whole number that has more than two factors.
The number 1 is a special case and is neither prime nor composite because it has only one factor.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter