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# Final List

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

acute triangle | a triangle in which each of the three angles is acute (less than 90 degrees) |

additive pattern | a pattern that occurs when the same value is added to each input to determine the output or y = x + a |

area | the number of square units inside a closed 2D space |

congruent | of equal measure; having the same size and same shape |

decagon | polygon with 10 sides and 10 angles |

denominator | the part of a fraction below the bar that tells how many equal parts there are |

difference | the part remaining in subtraction |

equilateral triangle | a special isosceles triangle with three equal sides and 3 acute 60 degree angles |

heptagon | polygon with 7 sides and 7 angles |

hexagon | polygon with 6 sides and 6 angles |

inverse operations | opposite operations, or ones that undo each other such as addition and subtraction or multiplication and division |

isosceles triangle | a triangle with at least two congruent sides with all acute, one obtuse, or one right angle |

multiplicative pattern | a pattern that occurs when the same value is multiplied by an input to determine the output or y = ax |

nonagon | polygon with 9 sides and 9 angles |

numerator | the part of a fraction above the bar that tells the number of fractional pieces being used |

obtuse triangle | a triangle that has one obtuse angle (greater than 90 degrees) and two acute angles |

octagon | polygon with 8 sides and 8 angles |

ordered pairs | a pair of numbers used to locate a point on a coordinate plane (x, y) |

parallel lines | lines in the same plane that do not cross each other; they stay the same distance apart |

parallelogram | a quadrilateral where opposite sides are parallel and congruent |

perimeter | a linear measurement around the outer edge of a figure |

pentagon | polygon with 5 sides and 5 angles |

perpendicular lines | lines that intersect at right angles to each other to form square corners |

polygon | a closed plane figure formed by three or more line segments (no curves) |

product | the total when two or more factors are multiplied |

quadrilateral | polygon with 4 sides and 4 angles |

rectangle | a quadrilateral that is a parallelogram and has four right angles |

regular polygon | polygon with all sides and all angles congruent |

rhombus | a quadrilateral that is a parallelogram and has four congruent sides |

right triangle | a triangle with one right angle (exactly 90 degrees) and two acute angles |

scalene triangle | a triangle with no congruent sides with all acute, one obtuse, or one right angle |

square | a quadrilateral that is a parallelogram and has four right angles (rectangle) and four congruent sides (rhombus) |

sum | answer to addition |

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

triangle | polygon with 3 sides and 3 angles |

x - coordinate | the first number in an ordered pair; it tells how far left or right to move from (0,0) |

y - coordinate | the second number in an ordered pair; it tells how far up or down to move from (0,0) |

base | the surface a solid object stands on |

base area | designated as a capital B in formulas and refers to the area of one of the bases in a solid |

composite number | a whole number with more than 2 factors |

cube | 3D figure that is a special rectangular prism with 6 square faces |

dimension | measure of length in one direction |

divisible | when a number can be divided by another with a whole number quotient and no remainder |

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

rectangular prism | 3D figure that has 6 rectangular faces, 12 edges, and 8 vertices |

prime number | a whole number greater than 1 with exactly two factors |

quotient | the size of each group or the number of groups when the dividend is divided by the divisor |

volume | the measure of the space occupied by matter; l x w x h = rectangular prism |

whole numbers | the set of counting numbers and zero (0, 1, 2, 3....) |

numerical expression | a mathematical phrases that uses only numbers and operation signs |

equation | a mathematical sentence that shows two things are equal |

order of operations | the rules that say which calculation comes first when simplifying and expression (PEMDAS) |

associative property | different combinations do not affect sums 1 + (2 + 3) = (1 + 2) + 3, or products 2 x (3 x 4) = (2 x 3) x 4; it does not apply to subtraction or division |

axes | the horizontal, (x), and vertical, (y), lines that act as reference points when plotting points on a coordinate grid |

coordinate grid | a two-dimensional plane on which to plot points, lines, and curves |

commutative property | order does not affect sums 2 + 3 = 3 + 2, or products 4 x 5 = 5 x 4; it does not apply to subtraction or division |

distributive property | in multiplication a factor can be broken into pieces; 4 x 56 = 4 x 50 + 4 x 6 |

expanded form | the representation of a number as a sum of place values like 57 = 50 + 7 |

expanded notation | the representation of a number as a product of the digit and its place value like 57= 5 x 10 + 7 x 1 |

hundredths | second decimal place to the right |

origin | the starting point where the axes of a coordinate plane intersect; (0, 0) |

tenths | first decimal place to the right |

thousandths | third decimal place to the right |

x-axis | the horizontal (left to right) line on a coordinate plane that runs through zero |

y-axis | the vertical (up and down) line on a coordinate plane that runs through zero |

improper fraction | a fraction where the numerator is larger than the denominator |

LCD | the least common multiple of the denominators of two or more fractions |

mixed number | a whole number and a fraction together |

simplest form | a fraction where the numerator and the denominator do not have any common factors except 1 |

unit fraction | a fraction whose numerator is 1 |

gross income | income before any taxes or deductions are taken out of it |

income tax | money paid to the government based on a person's income |

net income | income that remains after taxes and deductions are taken out of the gross income |

payroll tax | the amount of money an employer withholds from its employees' pay for federal and state taxes, health insurance, retirement, etc. |

property tax | a portion of the value of items that is paid to a city or state government (usually on cars, houses, boats, or land) |

sales tax | the amount of money collected by a store (retailer) in addition to goods or services (it is based on a percent of how much is spent) |