| A | B |
|---|
| ratio | A comparison of two numbers by division |
| rate | A ratio of a to b where a and b represent quanitities measured in different units |
| unit analysis | The process of selecting conversion factors to produce the appropriate units |
| Proportion | An equation that states that two ratios are equal. |
| Extremes of a proportion | In the proportion, a/b =c/d , a and d are the extremes. |
| Means of a proportion | In the proportion, a/b=c/d , b and c are the means. |
| Cross products | In a proportion, a/b =ac/d , the products of ad and bc. These products are equal. |
| Similar figures | Figures that have the same shape, but not necessarily the same size. |
| Scale drawing | An enlarged or reduced drawing similar to an actual object or place. |
| Scale | The ratio of a distance in a drawing to the actual distance. |
| Percent of change | The ratio of the amount of change to the original amount expressed as a percent. |
| Percent of increase | The percent of change found when the original amount increases. |
| Percent of decrease | The percent of change found when the original amount decreases. |
| Greatest possible error | One half of the measuring unit, for any measurement. |
| Percent error | The ratio of the greatest possible error to the measurement. |
