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### A Glossary of Mathematical Terms - R

#### Range

In a set of data it is the difference between the largest and the smallest value of data.

#### Ratio

The quotient of two quantities.

#### Reciprocals (Multiplicative inverses)

Two numbers whose product is 1.

#### Reduction of a fraction

The process of finding and removing all common factors between the numerator and the denominator.

See Flip.

#### Reflex (Concave)

See Angle and Polygon.

#### Remainder

The difference of the dividend and the greatest multiple of the divisor, which is less than the dividend.

#### Repeating decimal

A decimal like 2.343434...

#### Root

Of an equation;
of a quantity (square root, cube root, ...).

See Parenthesis.

#### Rounding

A process that replaces a number with a value closest to the original, but with a specified number of decimal places or digits: 37.39 rounded to the nearest tenth is 37.4; 123 rounded to the nearest ten is 120.

first published on september 01 2003 - last updated on september 01 2003