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# Pre-Algebra Ch. 6

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

constant of proportionality | a constant ratio or unit rate of a proportion |

cross products | if a/c = b/d then ad = bc |

discount | the amount by which the regular price of an item is reduced |

percent equation | an equivalent form of a percent proportion, where % is written as a decimal (part = percent x whole) |

percent of change | the ratio of the increase or decrease of an amount to the original amount |

percent of decrease | the ratio of an amount of decrease to the previous amount, expressed as a percent / a negative percent of change |

percent of increase | the ratio of an amount of increase to the original amount, expressed as a percent |

percent proportion | part/whole = % / 100 |

population | a larger group used in statistical analysis |

proportion | a statement of equality of two or more ratios |

proportional relationship | the ratios of related terms are equal |

rate | a ratio of two measurements having different unit rates |

ratio | a comparison of two numbers by division |

sample | a subgroup or subset of a population used to represent the whole population |

scale | the relationship between the measurements on a drawing or model and the measurements of the real object |

scale drawing or scale model | a drawing that is used to represent an object that is too large or too small to be drawn at actual size |

scale factor | the ratio of a length on a scale drawing or model to the corresponding length on the real object |

simple interest | the amount of money paid or earned for the use of money (I=prt) |

unbiased sample | a random sample that is representative of a larger sample |

unit rate | a rate simplified so that it has a denominator of 1 |

Created by:
Miss Brinkoetter