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EnchantedLearning.com Math Dictionary

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Q is for ...

Q.E.D. Q.E.D. is an abbreviation of the Latin phrase "quod erat demonstrandum" (meaning "that which was to be demonstrated"). Q.E.D. can be written at the end of a mathematical proof to show that the proof is complete.

quadrant A quadrant is a quarter of a plane. The x-axis and y-axis divide the x-y plane into four quadrants. The axes themselves are not part of the quadrants.

quadratic equation A quadratic equation is an equation that has a second-degree term and no higher terms. A second-degree term is a variable raised to the second power, like x2, or the product of exactly two variables, like x and y. When you graph a quadratic equation in one variable, like y = ax2 + bx + c, you get a parabola, and the solutions to the quadratic equation represent the points where the parabola crosses the x-axis.

quadratic formula The quadratic formula is a formula that gives you a solution to the quadratic equation ax2 + bx + c = 0. The quadratic formula is obtained by solving the general quadratic equation.

quadrilateral A quadrilateral is a four-sided figure. The square, rectangle, rhombus, trapezoid, kite, and parallelogram are quadrilaterals.

quart A quart is one-fourth of a gallon. Four quarts make one gallon.

quarter A quarter is a coin that is worth 25 cents. Four quarters make one dollar.

quartile A quartile for a data set is one of three data points that divide the set of data into four parts, each containing a quarter of the data. The first point marks the lower quartile boundary at the 25th percentile. The second marks the middle quartile (or midpoint of the data set), the median or the 50th percentile. The last marks the upper quartile (or 75th percentile) of a frequency distribution.

quotient The quotient is the answer in long division. The dividend divided by the divisor is the quotient (plus a remainder).

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EnchantedLearning.com Math Dictionary

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Counting

Addition

Subtraction

Multiplication

Division

Number Line

Fractions

Decimals

Graphs

Measurement

Rounding

Click on an underlined word for more information on that subject. If the math term you are looking for is not in the dictionary, please e-mail us.

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