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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  