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# 8th Math 1st 9wks

### Real Number System and Order of Operations

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

Real Number | All numbers (both rational and irrrational) |

Natural Number | Counting numbers |

Whole Number | Counting numbers including zero |

Integer | Whole numbers and their opposites |

Rational Number | Numbers that can be written as a fraction, repeating, or terminating decimal |

Irrational Number | Numbers that can not be written as a fraction,repeating, or terminating decimals |

Square Root | One of two equal factors of a number |

Repeating Decimals | Decimals whose digits repeat in groups of one or more |

Terminating Decimals | Decimals whose digits end |

Variable | A letter that represents an unknown value |

Numerical Expression | A mathematical expression that has a combination of numbers and at least one operation symbol |

Algebraic Expression | A mathematical expression that has a combination of numbers, letters, and at least one operation symbol |

Equation | A mathematical sentence that contains an equal sign |

Simplify | Solve a numerical expression |

Evaluate | To find the value of an expression by replacing (substituting) the variables with numbers |

Power | Numbers written using exponents that represent repeated multiplication |

Order of Operations | Rules that are followed when more than one operation is used in an expression |

Solve | The process of finding valus of the variables that make the equation true |

Solution | Values that are true to an equation |

Inverse Operations | Operations that undo each other (addition:subtraction, multiplication:division) |

Open Sentence | An equation that contains one or more variables |

Pythagorean Theorem | Describes the relationship between the lengths of the legs and the hypotenuse of any right triangle |

Right Triangle | A triangle with one right angle |

Hypotenuse | Side opposite the right angle and known as the longest side |

Legs | The sides that form the right angles |

Coordinate Plane | Formed by the intersection of two number lines that produces four right angles |

Origin | The point of intersection of the x and y axis |

Quadrants | The four sections created by the intersection of the x and y axis |

X-axis | The horizontal number line |

Y-axis | The vertical number line |

Ordered Pair | The x and y values graphed on the coordinate plane |

Created by:
tamarablyons