Identify and describe properties of prime, composite, square and triangular numbers(ACMNA122)
Know:
- What a number is.
- Numbers can be classified into different categories
Understand:
- That certain numbers can be classified by their properties..
Do:
- I can identify prime, composite, square and triangular numbers.
Essential Questions:
- What are integers?
- When do we work with integers in the real world?
- Are there only positive numbers in the world?
- Does adding two numbers always give me a positive answer?
Prime Numbers
Are numbers that only can be divided by 1 and itself.
For example, 13 is a prime number because it can only be divided by 1 and 13.
These are the prime numbers under 100.

Composite Numbers
Are numbers that have more than 2 factors. A factor is a number that can divide evenly into another number.
For example, 25 is a composite number because it can be divided evenly by 1 , 5 and 25.
These are the composite numbers under 100.

Square Numbers
Are numbers that form perfect squares. An easy way of finding square numbers is multiplying a number by itself.
For example, 1 x 1 = 1, 2 x 2 = 4, 3 x 3 = 9, 4 x 4 = 16. These are all square numbers.

Triangle Numbers
Are numbers that form perfect triangles.
Notice the pattern,
1
1+2 = 3
1+2+3 = 6
1+2+3+4 = 10
1+2+3+4+5 = 15
…

All the square numbers under 150.
