Cool math .com - Online Math Dictionary

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Online Math Dictionary: N
Easy to understand math definitions for K-Algebra mathematics
Just scroll down or click on the word you want and I'll scroll down for you!

natural numbers	negative numbers	nonagon
null set	number	number line
numerals	numerator

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Natural numbers
The Natural numbers are: { 1, 2, 3, 4, 5, 6, ... }
The natural numbers are the counting numbers without zero.

Negative numbers
Negative numbers are those that appear to the left of zero on the number line.

Nonagon
A nonagon is a nine sided polygon. The picture on the right is a regular nonagon since all the sides and angles are the same. (congruent.)
For more info, check out Properties of Nonagons.

nonagon

Null set
A null set is the same as an "empty set." A null set is a set with no members (or elements). The symbol for the null set is on the right.
It can also be written as an empty set of set brackets:
{ }
Putting the null set symbol inside the set brackets is a bad thing... But, is a common mistake, so don't do it!

null set symbol

Number
A number represents the value or quantity of something... Like how much money you have... Or how many marbles you have... Or how tall you are.

Number Line
A number line is an infinitely long line whose points match up with the real number system.

Numerals
A numeral is a symbol that represents a number.

Numerator
A numerator is the top number in a fraction.

For more info, check out my lessons on fractions.

no
J's

no
X's

no
Y's

no
Z's

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