
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: 98=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 