Online Math Dictionary: D
Easy to understand math definitions for KAlgebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!
decagon  decameter  deceleration 
decimal  degree of an angle  degree of a polynomial 
denominator  diameter  difference 
digit  dihedral angle  distributive property 
dividend  divisor  dodecagon 
dodecahedron 
Decagon A decagon is a ten sided polygon. The picture on the right is a regular decagon since all the sides and angles are the same (congruent.) For more info, check out Properties of Decagons. 
Decameter
A decameter is 10 meters (in the metric system). The prefix "deca" mean "ten of." In U.S. measurement, a decameter is about 32.808 feet.Deceleration
Deceleration is a slowing down of your speed (velocity). In physics, you just say "acceleration" whether you are speeding up or slowing down... It just means that the speed is changing. Decelerating is slowing down.
Decimal
Decimal numbers are like fractions because they count PART of something. Whole numbers (0, 1, 2, 3, ...) count whole things  like a whole pizza. You can use a decimal number to count part of the pizza. Half of a pizza would be 0.5 of a pizza. Onefourth of a pizza would be 0.25 of a pizza.
Examples: 2.34 45.009 0.3737373
For more info on decimals, check out my decimal lessons.


Degree of a Polynomial To find the degree of a polynomial, just find and count the biggest exponents. The green polynomial below is a 3rd degree polynomial because the biggest power is a cube. The purple polynomial below has a degree of 10 since8+2=10 and that's the biggest one. For more info, check out my algebra lesson on polynomials. 





Difference The difference is the answer you get when you subtract one number from another number. Example: The difference of 8 and 3 is 5. For more info, check out my Subtraction Lessons. 

Digit Digits are the numbers we use for counting: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 



Distributive Property of Arithmetic and Algebra The distributive property of arithmetic and algebra is a math rule that is always true. Here it is with letters: a ( b + c ) = ab + ac This property is giving you instruction on how to deal with those parenthesis. Remember that you always do what's in the parenthesis ( ) first... But, in Algebra, you may not be able to add the b and the c... So, this property tells you what to do... You distribute the a to the b and, then you distribute the a to the c. Here it is with numbers so you can check this for yourself! 

Dividend In a division problem, the dividend is the number you are dividing INTO. In the problem below, the 6 is the dividend. For more info, check out my Division Lessons. 

Divisor In a division problem, the divisor is the number you are dividing BY. In the problem below, the 3 is the divisor. For more info, check out my Division Lessons. 




A  B  C  D  E  F  G  H  I  no J's 
K  L  M 
N  O  P  Q  R  S  T  U  V  W  no X's 
no Y's 
no Z's 