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# 2012-7thMathPTVocab2

### South Habersham Middle School 7th Grade Math Powertime Vocabulary Unit 2

Word | Definition |
---|---|

Variable | A symbol, usually a letter, which is used to represent one or more numbers. |

Numerical expression | An expression consisting of numbers and operations. Example 5 + 5 = 10 |

Algebraic expression | An expression consisting of at least one variable and also consists of numbers and operations. Example b + 3 = 7 |

Term | A number, a variable, or a product and a number and variable. |

Coefficient | The number part of a term that includes a variable. For example, 3 in the term 3x. |

Constant | A quantity having a fixed value that does not change or vary, such as a number. For example, 5 in the expression x + 5. |

Equation | A mathematical sentence formed by setting two expressions equal. Example 3 + 3 = 6 |

Inequality | A mathematical sentence formed by placing inequality symbol between two expressions. A+5<10 |

Fraction | A number expressed in the form a/b where a is a whole number and b is a positive whole number. |

Multiplicative inverse | Two numbers whose product is 1. Example (3/4) and (4/3) because 3/4 × (4/3) = (4/3) × 3/4= 1. |

Percent rate of change | A rate of change expressed as a percent. Example: if a population grows from 50 to 55 in a year, it grows by 5/50 = 10% per year. |

Ratio | A comparison of two numbers using division. |

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

Scale factor | A ratio between two sets of measurements. |

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