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

[/fusion_text][fusion_text]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?

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# What are variables?

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

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