How can ratios provide new ways to relate numbers?

Students employ ratios to represent relationships between quantities.

A ratio can express part-part or part-whole relationships between two countable or measurable quantities.

A ratio can be expressed with a fraction or with a colon.

A percentage represents a part-whole ratio that compares a quantity to 100.

A ratio is a comparison of two quantities in a specific situation.

Fractions, decimals, ratios, and percentages can represent the same part-whole relationship.