**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.**

# Prime, Composite, Square and Triangle Numbers Videos

**Student Generated Videos**

**Student Generated Videos**