**Introduce the concept of variables as a way of representing numbers using letters (ACMNA175)**

**LO: To understand the concept of variables used to represent numbers.**

**Know:**

- What a variable is.
- That a variable can be used to replace a number

**Understand:**

- That variables can be used to replace a number

**Do:**

- I can replace a number with a variable

**Essential Questions:**

- What is a variable?
- How can variables replace numbers?

### Variables are “missing values“.

A pronumeral is a letter or symbol that is used in place of a number.

### In real life, someone might ask you, something plus 5 makes 10. What is something?

### In Numeracy terms, mathematicians are a bit lazy so they want to make it as easy as possible, so they write “x” in place of something, so that it looks more like (x + 5 = 10).

**Why do we need to use letters?**

-letters are easier to write than something.

-if there are more than 1 missing value, then we can use multiple letters.

### In some equations, you might have multiple variables, like I = PRT or E = MC^2 or S = D/T

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**Operations with Variables**

### 7x is the same as 7 times x.

x/5 is the same as x divided 5.

*Textbook Questions/Worksheets*

*Student GeneratedÂ Videos*