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Dekameters	A unit of length that is equal to 10 meters.

Denominator	The bottom number in a fraction Example: 15/16 16 is the denominator

Density	Mass per unit volume of a substance. Example: Units: g/cm3 or g/ml

Diagram	A figure, usually a line drawing, that illustrates a geometrical theorem.

Diameter	The measurment of a line that passes from one side of a circle to the other side of the circle, through the center point.

Difference	the amount by which one number differs from another Example: 9-8=1 the difference of 9 and 8 is 1

Directrix	a fixed line associated with a parabola

Dividend	the number being divided Example: 9÷3=3 9 is the dividend

Divisible	Capable of being evenly divided by a number, without a remainder.

Division	the process of finding out how many times a number is contained in another Example: 6÷3=2 3 is in 6 two times

Divisor	the number doing the dividing Example: 10÷2=5 2 is the divisor