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# 7th Grade Math Vocab

### Vocabulary and know-how for 7th grade math.

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

Sum | The answer to an addition problem. |

Difference | The answer to a subtraction problem. |

Product | The answer to a multiplication problem. |

Quotient | The answer to a division problem. |

Natural Numbers | The counting numbers. 1,2,3... |

Whole Numbers | The counting numbers, and 0. 0,1,2,3... |

Integers | Whole numbers and their opposites. ...-3,-2,-1,0,1,2,3... |

Rational Numbers | Any number that can be written as a fraction, where the denominator does not equal 0. 3/4, 0.45, 0.33333... |

Irrational Numbers | Any number that cannot be written as a fraction. The decimal does not repeat or terminate. pi, 0.734564827... , the square root of an imperfect square. |

Exponent | The number that tells the base how many times to multiply by itself. |

Diameter | The distance from one outer part of a circle to another, while passing through the center. |

Radius | The distance from the outside to the middle of a circle. |

Circumference | The distance around a circle. |

Area | How many square units are inside of a polygon. |

Perimeter | The distance around a polygon. |

Percentage | A ratio of a number to 100. |

Ratio | A comparison of two quantities by division. |

Proportion | A statement that shows a ratio equals another ratio. |

Rate | The ratio of one unit to a different unit. |

Order of Operations | The way of simplifying expressions correctly. PEMDAS |

Bar Graph | This graph compares different categories to another. |

Line Graph | This graph shows change over a certain period of time. |

Circle Graph | A graph that shows what percent is taken by a certain category. |

Histogram | This graph shows the frequency of something using intervals. The bars are connected to one another. |

Origin | The point (0,0) is referred to as this. |

Quadrant I | Both x and y are positive values in this quadrant. |

Quadrant II | x is negative and y is positive in this quadrant. |

Quadrant III | Both x and y are negative in this quadrant. |

Quadrant IV | x is positive and y is negative in this quadrant. |

x-axis | The horizontal axis. |

y-axis | The vertical axis. |

Translation | A slide from one point to another on a graph. |

Reflection | A flip from one point on a graph to another, over an axis. |

Complementary Angles | Two angles that add up to 90 degrees. |

Supplementary Angles | Two angles that add up to 180 degrees. |

Right Angle | A 90 degree angle. |

Obtuse Angle | An angle that is greater than 90 degrees, but less than 180 degrees. |

Acute Angle | An angle that is less than 90 degrees, but greater than 0 degrees. |

Scalene Triangle | A triangle with no equal sides. |

Isosceles Triangle | A triangle with two equal sides. |

Right Triangle | A triangle with a 90 degree angle.q |

Less Than | < |

Greater Than | > |

Less Than or Equal to | Closed circle, shading to the left represents this inequality. |

Greater Than or Equal to | Closed circle, shading to the right represents this inequality. |

Cross Products | Multiplying diagonally to see if two ratios are proportional. |

Nearest Tenth | When 0.878 is rounded to 0.9; it is rounded to this place value. |

Nearest Hundredth | When 0.7684 is rounded to 0.77; it is rounded to this place value. |

Nearest Thousandth | When 0.7684 is rounded to 0.768; it is rounded to this place value. |

Nearest Whole | When 4.67 is rounded to 5; it is rounded to this place value. |

Nearest Ten | When 18 is rounded to 20; it is rounded to this place value. |

Nearest Hundred | When 564 is rounded to 600; it is rounded to this place value. |

Prime Number | A number greater than 1 with only two factors, itself and 1. |

Composite Number | A number greater than 1 with more than two whole number factors. |

Triangle | A polygon with 3 sides. |

Quadrilateral | A polygon with 4 sides. |

Pentagon | A polygon with 5 sides. |

Hexagon | A polygon with 6 sides. |

Heptagon | A polygon with 7 sides. |

Octagon | A polygon with 8 sides. |

Nonagon | A polygon with 9 sides. |

Decagon | A polygon with 10 sides. |