D Roman Numeral for 500
decagon a polygon with 10 sides
denominator the bottom part of a fraction
dice Usually a cube with the numbers 1 through to 6 on it, used most commonly in games
die singular for dice. A cube shape with numbers used often in games
distance how far between two points  D = st where s is speed and t is time
distance formula $$d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$$
dividend profits from shares expressed in dollars and cents
dividend yield profits from shares expressed as a percent   dividend yeild=$$\frac{dividend}{market value}\times 100$$
dodecagon polygon with 12 sides. A 50c piece is an example of a dodecagon
dozen 12

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