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1. | The set of positive whole numbers, their opposites, and zero. |

2. | A triangle with at least two congruent sides. |

3. | A comparison of two quantites by division. |

4. | One whole number divided by a second whole number with a remainder of zero. |

6. | A polygon with six sides. |

9. | Lines in the same plane that never intersect. |

10. | A series of points that extend in two opposite directions without end. |

11. | A number's distance from zero on a number line. |

12. | When the numerator and denominator have no common factors other than 1. |

14. | A mathematical sentence with an equal sign. |

17. | Tells you how many times a number or base is used as a factor. |

19. | pemdas |

20. | The sum of a data set divided by the number of data items. |

22. | A whole number with exactly two factors, 1 and itself. |

23. | A number written as the product of two factors, one a power of 10. |

25. | Formed by two rays with a common endpoint. |

26. | Operations that undo each other. |

27. | The sum of the measures of two angles is 90 degrees. |

29. | The distance around a circle. |

30. | A symbol that represents one or more numbers. |

31. | An equation stating that two ratios are equal. |

32. | A quadrilateral with exactly one pair of parallel sides. |

37. | The point of intersection of the x and y axes. |

38. | A ratio that compares a number to 100. |