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  


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

red line

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


red line

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

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

a number line

red line

A numeral is a symbol that represents a number.

red line

numerator is the top number in a fraction.

For more info, check out my lessons on fractions.


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