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Matrix	A rectangular array of numbers, algebraic symbols, or mathematical functions.

Mean	a value that is calculated by dividing the sum of terms by the number of terms. Also known as an average.

Median	A value within a set of terms where there are an equal number of terms larger and smaller.

Metric System	A decimal system of weights and measures, universally used in science, and the official system of measurement in many countries.

Micrometer 1	A device for measuring very small distances, objects, or angles, especially one based on the rotation of a finely threaded screw, as in relation to a microscope.

Micrometer 2	A unit of length equal to one thousandth (10-3) of a millimeter or one millionth (10-6)of a meter.

Mixed Number	a whole number and a fraction Example: 5 1/2

Mixed Number	A number consisting of a whole number and a fraction or a decimal. Example: 5 1/2, 7.34

Mode	A value in a set of data that occurs most often.

Multiplication	the process of repeating additions of the same number Example: 9 x 9 =81