Online Math Dictionary: O
Easy to understand math definitions for KAlgebra mathematics
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oblique angle  oblique prism  oblique triangle 
obtuse angle  obtuse triangle  octagon 
octahedron  odd numbers  order of operations 
ordered pair  origin  orthogonal 
oval 













Odd Numbers An odd number is a number that is not even  meaning that an odd number is NOT cleanly divisible by 2. (When I say "cleanly divisible" I mean that there's no remainder.) So, when you divide an odd number by 2, you'll always get a remainder of 1. Example: 1, 3, 5, 7, ... 

Order of Operations Order of operations tells us what order we are supposed to do things in a math problem. For example, what's the answer to this? 4 + 10 x 2 Do we do the 4 + 10 first? Or the 10 x 2 first? Here is the official order of operations: (1) Parenthesis (2) Exponents (3) Multiplication & Division (4) Addition & Subtraction So, for 4 + 10 x 2, we do multiplication, then addition... 4 + 10 x 2 = 4 + 20 = 24. A common phrase to remember the order is: Please Excuse My Dear Aunt Sally. 

Ordered Pair An ordered pair is a set of two numbers in the form: (x, y) Example: (2, 3) Ordered pairs are used in Cartesian coordinates. 






A  B  C  D  E  F  G  H  I  no J's 
K  L  M 
N  O  P  Q  R  S  T  U  V  W  no X's 
no Y's 
no Z's 