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# 5th grade math

### academic vocab

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

Common Denominator | the same denominator used in two or more fractions |

Denominator | the bottom number in a fraction. Tells the number of pieces making up the whole |

Equivalent | having the same value |

Fraction | part of a whole |

Greatest Common Factor (GCF) | the largest number that divides evenly into two or more numbers |

Least Common Multiple (LCM) | the smallest whole number greater than 0 that is a common multiple of two or more numbers |

Multiple | skip counting |

Numerator | the top number in a fraction |

Simplify | to reduce a fraction to lowest terms |

Whole number | all counting numbers including 0 |

Factor | a number multiplied by another number |

Quotient | the answer to a division problem |

Product | the answer to a multiplication problem |

Difference | answer to a subtraction problem |

Sum | answer to an addition problem |

Compatible Numbers | numbers that are easy to calculate in your head |

Standard Form | the common way to write a number |

Expanded Form | the way to write a number showing the place value of each digit |

Word Form | the written form of a number without using digits |

Estimate | an approximate number; not the exact value |

Dividend | the number to be divided (goes inside) |

Divisor | the number used to divide another number (goes outside) |

Remainder | a number left over after division is complete |

Factor Tree | a diagram that shows the prime factorization of a composite number |

Improper fraction | a fraction whose numerator is greater than the denominator |

Mixed Number | a number that has a whole number part and a fractional part |

Prime Number | a whole number greater than 1 with ONLY two factors, 1 and itself |

Composite Number | a whole number greater than 1 that has more than 2 factors |

Unit fraction | a fraction where the numerator is 1 and the denominator is a positive number |

Convert | to change from one form to another |

Area | the number of square units needed to cover a space; L x W |

Perimeter | the distance around the outside of a figure; add up all the sides |

Base Area | the area of one of the bases of a 3D figure; "B" |

Cubic Unit | a measure of volume. It is equal to the volume of a cube, which is 1 unit tall, 1 unit wide, and 1 unit long |

Height | the distance from top to bottom |

Volume | amount of space an object takes up; L x W x H |

Triangle | a three sided polygon |

Right triangle | a triangle with a right angle |

Isosceles triangle | a triangle with two equal sides |

Scalene triangle | a triangle with no equal sides |

Equilateral triangle | a triangle where all of the sides and angles are the same length |

Quadrilateral | a four sided polygon |

Parallelogram | a quadrilateral with opposite sides parallel |

Rectangle | a quadrilateral with straight sides where all interior angles are right angles |

Square | a quadrilateral, all sides have equal length, and every angle is a right angle |

Rhombus | a quadrilateral, all sides have equal length, opposite sides are parallel, and opposite angles are equal |

Trapezoid | a quadrilateral with at least one pair of parallel sides |

Pentagon | a 5 sided polygon |

Hexagon | a 6 sided polygon |

Heptagon | a 7 sided polygon |

Octagon | an 8 sided polygon |

Nonagon | a 9 sided polygon |

Decagon | a 10 sided polyhon |

Dodecagon | an 12 sided polygon |

Polygon | a closed figure with at least 3 straight sides and angles |

Parallel lines | lines that never get closer together, and never intersect |

Perpendicular lines | lines that intersect at a 90 degree angle |