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# 2013-7thMathPTVocab2

### SHMS 7th Grade Math Powertime Vocab 2

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

Algebraic expression | An expression consisting of at least one variable and also consists of numbers and operations. Example 2x + 3 |

Term | A number, a variable, or a product of 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 2x + 1 = 5 |

Inequality | A mathematical sentence formed by placing an 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 2 and 1/2 because 2 x (1/2) = 1 |

Percent of change | A rate of change expressed as a percent. This is found by finding the amount of change and dividing by the original amount. 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. |

Percent error | The difference between the actual and predicted amounts divided by the actual amount |

Created by:
hbogue