| Term | Definition |
| ratio | a comparison of two numbers by division |
| rate | a ratio of two quantities that have different values |
| unit rate | a rate with a denominator of 1 |
| proportion | an equation stating that two ratios are equivalent |
| how to solve proportions | cross multiply and divide |
| examples of scale models | blueprints, maps, architectural models, model cars |
| scale | the ratio between the model and the actual object |
| scale model | a smaller/larger verson of the actual model |
| Barbie dolls and action figures | NOT an example of a scale model |
| Equivalent ratios | two ratios with the same value or simplest form |