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Decagon - A polygon/shape that has ten angles and ten straight lines.

Decimal - A real number on the base ten standard numbering system.

Denominator - The denominator is the bottom number of a fraction. (Numerator is the top number) The Denominator is the total number of parts.

Degree - The unit of an angle, angles are measured in degrees shown by the degree symbol: °

Diagonal - A line segment that connects two vertices in a polygon.

Diameterl - A chord that passes through the center of a circle. Also the length of a line that cuts the shape in half.

Difference - The difference is what is found when one number is subtracted from another. Finding the difference in a number requires the use of subtraction.

Digit - Digits are making reference to numerals. 176 is a 3 digit number.

Dividend - The numer that is being divided. The number found inside the bracket.

Divisor - The number that is doing the dividing. The number found outside of the division bracket.

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