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## Congruent

Definition:  Two plane or solid figures are congruent if one can be obtained from the other by rigid motion (a sequence of rotations, reflections, and translations).C

## Complex Fractions

Definition:  A fraction A/B where A and/or B are fractions (B nonzero).

## Quartiles

Definition:  Quartiles are the values that divide a list of numbers into quarters.

Definition:  Two numbers whose sum is 0 are additive inverses of one another. Example: 3/4 and – 3/4 are additive inverses of one another because 3/4 + (– 3/4) = (– 3/4) + 3/4 = 0.

## Multiplicative Inverse

Definition: Two numbers whose product is 1 are multiplicative inverses of one another. Example: 3/4 and 4/3 are multiplicative inverses of one another because 3/4   4/3 = 4/3   3/4 = 1.

## Midline

Definition:  In the graph of a trigonometric function, the horizontal line halfway between its maximum and minimum values.

## Integer

Definition:  A number expressible in the form a or –a for some whole number a.

## Fraction

Definition:  A number expressible in the form a/b where a is a whole number and b is a positive whole number. (The word fraction in these standards always refers to a non-negative number.) See also: rational number.

## Rational Expression

Definition:  A quotient of two polynomials with a non-zero.

## Median

Definition: A method of visually displaying a distribution of data values by using the median, quartiles, and extremes of the data set. A box shows the middle 50% of the data. Denoting the middle term of a series arranged in order of magnitude, or (if there is no middle term) the average of the middle two terms. For example, the median number of the series 55, 62, 76, 85, 93 is 76.