# Math Definitions - Letter O

### Chapters

### Octal

# Definition of Octal

**Octal** numbers are made up only of the digits \(\{0,1,2,3,4,5,6,7\}\). Each place in an octal number corresponds to a power of \(8\).

Because there are only \(8\) different possible digits in an octal number, we also call them Base \(8\) numbers.

For example, the octal number \(374\) is equal to the decimal number \(3 \times 8^2 + 4 \times 8^1 + 7 \times 8^0 = 3 \times 64 + 4 \times 8 + 7 \times 1 = 231\).

Some other examples of octal numbers are:

- \(77\), which corresponds to the decimal number \(63\).
- \(100\), which corresponds to the decimal number \(64\).
- \(101\), which corresponds to the decimal number \(65\).

### Description

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.

### Audience

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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