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# RISD 4th 9 wks math

### RISD 4th 9 wks. math vocab.

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 |

factor | a number that is multiplied by another number to find a product |

multiple | the product of a number and any whole number |

least common multiple | the smallest number, other than 0, that is a common multiple of two or more numbers |

greatest common factor | the largest factor that two or more numbers have in common |

prime number | a whole number greater than one with exactly two factors, 1 and itself |

composite number | a whole number that has more than two whole number factors |

percent | the ratio of a number to 100 |

ratio | a comparison of two quantities |

squared | raised to the power of 2 |

factor tree | a diagram showing the prime factorization of a number |

prime factorization | a composite number expressed as the product of its prime factors |

approximate | to estimate or come close to |

expression | a mathematical combination of numbers, variables, and operations |

equation | a mathematical sentence stating that two expressions are equal |

order of operations | the process of solving math expressions (PEMDAS: parenthesis, exponents, multiplication/division left to right, addition/subtraction left to right) |

median | the middle number in a set of data when the data is arranged in order |

mode | one of the values appearing most often in a set of data |

range | the difference between the highest and lowest values in a set of data |

mixed number | a whole number plus a fraction |

improper fraction | a fraction whose numerator is greater than or equal to its denominator |

area | the number of square units needed to cover a surface (the inside of a shape) |

perimeter | the distance around the outside of a 2 dimensional shape |

diameter | a line segment that passes through the center of a circle and endpoints on the circle |

radius | a line segment from the center of a circle to any point on the circle |

circumference | the distance around a circle |

parallelogram | a quadrilateral with opposite sides parallel and congruent and opposite angles are congruent |

rhombus | a parallelogram whose four sides are congruent and whose opposite angles are congruent |

triangle | a 3 sided polygon; all angles equal 180 degrees |

quadrilateral | a 4 sided polygon; all angles equal 360 degrees |

trapezoid | a quadrilateral that has only one pair of parallel sides |

octagon | an 8 sided polygon |

hexagon | a 6 sided polygon |

pentagon | a 5 sided polygon |

obtuse angle | an angle with a measure of more than 90 degrees but less than 180 degrees |

acute angle | an angle that measures greater than zero degrees and less than 90 degrees |

right angle | an angle with a measure of 90 degrees |

equilateral triangle | a triangle with 3 equal sides |

isosceles triangle | a triangle with 2 congruent sides |

scalene triangle | a triangle with no congruent ides |

vertex/vertices | the point where 2 rays meet, where 2 sides of a polygon meet, or where the edges of a 3D shape meet; the top point of a cone or pyramid |

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sgrubb