## Expressions and Variables

Expressions are a way to write a math situation.

Algebraic Expressions- contain at least one variable and at least one math operation.

Expressions do not have an answer without being told what number to substitute the variable for.

Algebraic Expressions- contain at least one variable and at least one math operation.

Expressions do not have an answer without being told what number to substitute the variable for.

- For example: The sum of a number and two can be written as x + 2. If we are told that x is 4, then the answer is 6, because 4+2 = 6. If we are told that x is 5, then the answer is 7, because 5+2=7.

Variable- a letter that represents an unknown amount

Expressions Learnzillion Codes:

LZ2335, LZ2360 for Equivalent

LZ2846, LZ2912, LZ3015, LZ2868, LZ2871 for Variables

LZ653, LZ654 for Evaluating

LZ2335, LZ2360 for Equivalent

LZ2846, LZ2912, LZ3015, LZ2868, LZ2871 for Variables

LZ653, LZ654 for Evaluating