A | B |

compatible numbers | numbers which are easy to compute with mentally |

Cross products | the products of the terms on the diagonals when two ratios are compared |

percent | the ratio of a number compared to 100 |

proportion | an equation which shows that two ratios are equal |

rate | comparsion of two numbers of different units of measure |

ratio | a comparsion of two numbers by division |

unit rate | a rate with a denominator of 1 |

reasonable answers | Answers which make sense when compared to the question |