# Prime and Composite Numbers

In this tutorial the students will learn how to classify the numbers from 1-100 as Prime, Composite or Neither. **Prime** number have **exactly** 2 factors, **1 and itself**. **Composite** numbers have **more than** 2 factors.

# Key Skills

## Prime Numbers

Have exactly 2 factors, 1 and itself

## Composite Numbers

Have more than 2 factors

## Multiplication tables

## Divisibility Rules

Rules on how to find out if a number is a divisor without having to do the divison.

## Divisors

1:All numbers are divisible by 1.2:All even numbers. Even numbers have a 0,2,4,6, or 8 in the ones place.3:The sum of the digits of the number is divisible by 3.4:If the last 2 digits of the number are divisible by 4.5:The digit in the ones place is a 5.6:If the number is divisible by both 2 and 3.8:If the last 3 digits of the number are divisible by 8.9:If the sum of the digits of the number are divisible by 9.

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