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#### Ontario Curriculum Expectation:

#### 2.C2.1 identify when symbols are being used as variables, and describe how they are being used.

A **variable** is a symbol such as a letter or question mark that represents a number we do not know.

#### Example 1:

#### Sammy has 4 cookies. Then, he buys more cookies. Sammy now has 7 cookies.

The **question mark** represents the unknown number of cookies Sammy buys.

#### Example 2:

#### Anne has 9 strawberries. Then, she ate some of the strawberries. Anne has 5 strawberries left.

The letter** ‘S’** represents the unknown number of strawberries Anne ate.