Author:
Kerrie Meagher

- I can explain whether a whole number is prime, composite or neither by finding the number of factors
- I can explain why a prime number, when modelled as an array, can have only one row

An activity to find the factors of the numbers 1 - 12 and determine whether the numbers are prime or composite

Tutorial

- Write the KEY WORDS and their definitions into your notebook
- Add your own examples
- Complete Activity Sheet 1 - Factors of Numbers 1 to 12
- Answer these questions in your notebook:

- What is the only even prime number?
- Why is 1 neither prime nor composite?
- Do all composite numbers have an even number of factors?

**Factor:** A whole number that divides evenly into another whole number.

*Example: 3 and 4 are factors of 12 because 12 ÷ 3 = 4*

____________________________________________________

**Prime Number:** A whole number that can only be divided evenly by 1 and itself (that is, it has only 2 factors).

*Example: 5 is a prime number because it can only be divided evenly by 1 and 5*

_____________________________________________________

**Composite Number:** A whole number than can be divided evenly by more than 2 factors

*Example: 10 is a composite number because it can be divided evenly by 1, 2, 5 and 10*

Full Screen

Source: Kerrie Meagher