In this Grade 4 enVision Mathematics lesson from Chapter 7 on Factors and Multiples, students learn to identify whole numbers as prime or composite by examining their factors. A prime number has exactly two factors (1 and itself), while a composite number has more than two factors, and students practice applying these definitions to numbers up to 97. The lesson also addresses the special case that 1 is neither prime nor composite.
Section 1
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.
Expand to review the lesson summary and core properties.
Section 1
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.