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#### Ontario Curriculum Expectation:

#### 4.C2.1 identify and use symbols as variables in expressions and equations.

A** variable **is a letter of the alphabet or symbol that represents a number we don’t know. It can represent any number.

A **constant **is a number and it does not change.

**Stanley is ***x* **years old. *** x *is a variable that represents Stanley’s age.

*can represent*

*x***any number**.

**Owen ate 6 cookies and Oliver ate ***n ***cookies. **6 is a **constant **because it represents 6 and does not change. * n *is a

**variable**that represents the number of cookies Oliver ate.