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# unit 3 Vocabulary

### Ratios, Rates, and Proportions

Term | Definition |
---|---|

Complex Fractions | A fraction that has a fraction in its numerator, denominator or both. |

Constant of Proportionality | The constant ratio between two quantities in a proportional relationship. |

Equivalent ratios | Ratios that name the same comparison |

Indirect Measurement | The technique of using similar figures and proportions to find a measure. |

Percent of Decrease | A percent change describing a decrease in a quantity. |

Percent of Change | The amount stated as a percent that a number increases or decreases. |

Percent of Increase | A percent of change describing an increase in a quantity. |

Principal | The initial amount of money borrowed or saved. |

Proportion | An equation that states that two ratios are equivalent. |

Proportional Relationship | A relationship between two quantities in which the ratio of one quantity to the other quantity is constant. |

Scale | The ratio between two sets of measurement. |

Scale Drawing | A drawing that uses a scale to make an object smaller than or larger than the real object. |

Simple Interest | A fixed percent of the principal. It is found using the formula I=Prt, where P represents the principal, r the rate, and t the time. |

Unit Rate | A rate in which the second quantity in the comparison is one unit. |