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+,   Math Dictionary 
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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 xaxis and yaxis divide the xy plane into four quadrants. The axes themselves are not part of the quadrants. 
quadratic equation A quadratic equation is an equation that has a seconddegree term and no higher terms. A seconddegree term is a variable raised to the second power, like x^{2}, or the product of exactly two variables, like x and y. When you graph a quadratic equation in one variable, like y = ax^{2} + bx + c, you get a parabola, and the solutions to the quadratic equation represent the points where the parabola crosses the xaxis. 
quadratic formula The quadratic formula is a formula that gives you a solution to the quadratic equation ax^{2} + bx + c = 0. The quadratic formula is obtained by solving the general quadratic equation. 
quadrilateral A quadrilateral is a foursided figure. The square, rectangle, rhombus, trapezoid, kite, and parallelogram are quadrilaterals. 
quart A quart is onefourth 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). 
+,   Math Dictionary 
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Counting  Addition  Subtraction  Multiplication  Division 
Number Line  Fractions  Decimals  Graphs  Measurement  Rounding 
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