Math Definitions - Letter O

Odd Number

Definition of Odd Number

Definition of Odd NumberDefinition of Odd Number

An odd number is an integer that cannot be written as \(2\) times another integer.

For example, \(11\) is an odd number. The picture shows \(11\) shapes divided up into groups of two. There is one left over. This tells us that \(11\) is odd.

Every odd number has \(1,3,5,7\) or \(9\) as its final digit.

Some examples of odd numbers are \(-579\), \(-5\), \(3\), \(23\) and \(1,542,692,377\).


The aim of this dictionary is to provide definitions to common mathematical terms. Students learn a new math skill every week at school, sometimes just before they start a new skill, if they want to look at what a specific term means, this is where this dictionary will become handy and a go-to guide for a student.


Year 1 to Year 12 students

Learning Objectives

Learn common math terms starting with letter O

Author: Subject Coach
Added on: 6th Feb 2018

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