# Prime or Composite Worksheets

What makes a number Prime or Composite? Prime or composite numbers are the base or grounds of mathematical concepts. They are the two numbers that are most used in mathematics. Before you dig in to discover what makes a number either prime or composite, let us find out the basic definition of Prime or Composite number. A Prime number is a number that has only two factors, which means that the number can be multiplied only by two numbers. One is itself, and the other one is number 1. On the other hand, a composite number is one that has a series of different factors in addition to 1 and the number itself. However, number 1 and 0 are neither Prime nor composite. The quality of prime number being divisible by only itself and number 1 makes it a prime number. And the quality of composite number being divisible by itself, 1 and a series of other numbers make it a composite number. Example of Prime numbers; 5, 3, 7, 9 etc. And the example of composite numbers is 4, 6, 8, and 10.

• ### Basic Lesson

Demonstrates the differences between prime and composite numbers. A prime number is a natural number greater than 1 that has only two factors, itself and 1. A composite number is a natural number that has factors other than itself and 1. Practice problems are provided.

• ### Intermediate Lesson

Explains how to classify numbers as prime or composite. Practice problems are provided. Classify the 17 as a prime or composite number. Factors of 17 are 1 and itself (17) only.

• ### Independent Practice 1

Classify each number as prime or composite. The answers can be found below.

• ### Independent Practice 2

Features another 20 Prime or Composite problems.

• ### Homework Worksheet

12 Prime or Composite problems for students to work on at home. Example problems are provided and explained.

• ### Topic Quiz

10 Prime or Composite problems. A math scoring matrix is included.

• ### Homework and Quiz Answer Key

Answers for the homework and quiz.

• ### Lesson and Practice Answer Key

Answers for both lessons and both practice sheets.

#### Those Romans

Riddle: Why didn't the Romans find algebra challenging?

Answer: Because X was always 10