| amount | In a percent problem, the portion of the whole corresponding to the percent. |
| base | In a percent problem, the base represents how much should be considered 100% (the whole); in exponents, the base is the value that is raised to a power when a number is written in exponential notation. In the example of 53, 5 is the base. |
| equation | A mathematical sentence that shows that two expressions are equal. |
| percent | A ratio that compares a number to 100. “Per cent” means “per 100,” or “how many out of 100.” |
| proportion | An equation that states that two ratios are equal. |