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# Unit 0a

### Operations and Expressions

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

counting or natural numbers | The numbers we count with no decimals or fractions. 1, 2, 3, 4, 5… |

whole numbers | natural numbers plus 0: 0, 1, 2, 3, 4… |

integers | positive and negative whole numbers: …-3, -2, -1, 0, 1, 2, 3… |

operations | Any of the single steps in a math problem. (+- × ÷ exponents and parentheses) |

equation | A statement in math that says two things are equal using an equal sign. Ex: 2+3=5; 2x=4; y=2x-4 |

inequality | A statement in math that says one thing is greater than or less than or just not equal to another using one of the following signs: ˂ ≤ ≠ ≥ ˃. |

expression | A statement in math that does not have an equal or inequality sign. Ex.: 2; 2x; 2x^2+4; 2xy+3z+13 |

term | One part of an expression separated by a plus or minus sign. In 2x^2+4x-5, 2x^2, 4x and -5 are the ____________. |

variable | A letter representing a changing or unknown amount. In y = 2x – 4, y and x are _______________. |

constant | A term in an equation with no variable. In y = 2x – 4, 4 is a _____________. |

coefficient | The number that is being multiplied by a variable. In y = 2x – 4, 2 is a ______________. |

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meminot