# Math Dictionary q

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**Q**

**Q**1st quartile.It is 25% of the data.

_{1}:**Q**3rd quartile. It is 75% of the data.

_{3}:**Quadrangle :**Another name for Quadrilateral (a flat shape with four straight sides).

**Quadrant :**The four regions of a plane created by the intersection of the coordinate axes. Each of these quadrants has a number designation.

**Quadratic equation :**An equation that can be written in the form ax

^{2}+ bx + c = 0 , where a, b, and c are real con

**Quadratic formula :**

**Quadratic polynomial :**A polynomial with degree 2 is called quadratic polynomial.

**Quadruple :**4 times or multiply by 4.

**Quadrilateral :**A polygon with 4 sides.

**Quadrillion :**Usually means a thousand million millions. 1,000 x 1,000,000 x 1,000,000 = 1,000,000,000,000,000.

A 1 followed by 15 zeros, 1 × 10

^{15}

**Qualitative Data :**Qualitative data is descriptive information (it describes something)

**Quantitative Data :**Data that can be counted (called "discrete data") or measured (called "continuous data")

**Quantum theory :**A theory of Physics based on the assumption that energy exists in indivisible units.

**Quarter :**One of four equal parts.

Written as 1/4.

**Quartiles :**The values that divide a list of numbers into quarters.

**Quintal :**It is a ancient unit to measure mass.It is also known as 'ton'. 1 quintal = 100 kg.

**Quintic polynomial :**A Polynomial with degree 5 is called quintic polynomial.

**Quotient :**The answer after you divide one number by another.

dividend ÷ divisor = quotient

**Quotient rule:**This rule is used in derivative or differentiation.

If there are two different functions u and v then the derivative of (u/v) is given by

(u/v)' = (u'v - v'u)/v

^{2}

**Quiz:**Series of questions for testing knowledge.

**Math dictionary q**

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