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# Math Topic #2

### Variables, Expressions, and Properties

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

Input/Output Table | A table of related values. |

Variable | A quantity that can change or vary, often represented with a letter. |

Associative Property of Addition | The way numbers are grouped does not affect the sum. |

Commutative Property of Addition | The order in which numbers are added does not change the sum of the numbers. |

Algebraic Expression | A mathematical phrase that has at least one variable and one operation. |

Coefficient | The number that is multiplied by a variable in an algebraic expression. Example: For 6x + 5, the coefficient is 6. |

Commutative Property of Multiplication | The order in which numbers are multiplied does not change the product of the numbers. |

Associative Property of Multiplication | The way numbers are grouped does not affect the product. |

Identity Property of Addition | Adding zero to a number does not change the number. |

Substitution | To replace a variable with a number. |

Evaluate | To find the value of an expression. |

Order of Operations | A set of rules mathematicians use to determine the order in which operations are performed. |

Identity Property of Multiplication | The product of a number and one is that number. |

Distributive Property | Multiplying a sum (or difference) by a number gives the same result as multiplying each number in the sum (or difference) by the number and adding (or subtracting) the products. |