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| +, - | 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 A 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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| Counting | Addition | Subtraction | Multiplication | Division |
| Number Line | Fractions | Decimals | Rounding | Graphs |
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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