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EnchantedLearning.com
Math Dictionary
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undecagon

An undecagon is an eleven-sided 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 2x2 - 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.

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EnchantedLearning.com
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 e-mail us.


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