Math Definitions - Letter O

Ordinal Number

Definition of Ordinal Number

Definition of Ordinal Number

An ordinal number tells you the position of an object in a list of objects.

Some examples of ordinal numbers are first (\(1\)st), fourth (\(4\)th) and twenty-third (\(23\)rd).

In the picture, working from left to right, the pink and purple snail is first, the yellow and green snail is second, the red and brown snail is third, and the yellow and brown snail is fourth.


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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