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+,   Math Dictionary 
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undecagon An undecagon is an elevensided figure (hendecagon is another word for this figure). The Canadian one dollar coin (also called the loonie) is an undecagon. 
union A union of two sets A and B (written A U B) is the set consisting of all the elements that are in either or both of those two sets. For example if A={1, 2, 3} and B={3, 4, 5}, A U B= {1, 2, 3, 4, 5}. 
unit Unit means one. 
unit fraction A unit fraction is a fraction that has a one in the numerator, like 1/2, 1/3, 1/4, etc. 
unknown An unknown is a number whose value is not known. For example, in the equation 2x^{2}  3x = 6, x is the unknown. 
unlike fraction Unlike fractions are two or more fractions whose denominators are not the same, like 1/2, 1/3, and 1/5. 
+,   Math Dictionary 
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A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z 
Counting  Addition  Subtraction  Multiplication  Division 
Number Line  Fractions  Decimals  Graphs  Measurement  Rounding 
Click on an underlined word for more information on that subject. If the math term you are looking for is not in the dictionary, please email us.
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