# Prealgebra for Two-Year Colleges/Workbook AIE/Properties of addition

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## Contents

## Why[edit]

What does addition of fractions have in common with addition of decimals? What do these have in common with addition of expressions that contain variables? What does finding a perimeter have in common with balancing your checkbook?

## Learning Objectives[edit]

- Explain why when we add, we need common denominators or like place values or like terms or common units.
- Solve problems that involve finding totals, finding perimeters, or combining values.
- Use the commutative property of addition to aid in performing mental addition.