The prefix Octa means 8 in Greek**.** Hence the **Octal Number System (**base 8) comprises 8 numbers [ 0,1,2.... 7 ].

Though computers store numbers in binary (0 & 1),  it is hard and error prone for us to write in this format.  The Octal number system makes it easier for us to write and communicate a number in octal form.

By the end of this lesson, you will be able to perform octal addition and subtraction.

Estimated duration: 20 min

Lesson 1 of 5: Octal Number System

Octal Number System

The octal system has a positional numeration system of base 8. The eight digits are 0,1,2,3,4,5,6 and 7.

Lesson 2 of 5: Octal Addition

https://youtu.be/M4d7pQVqSa0?t=84

Lesson 3 of 5: Octal Subtraction

https://youtu.be/aCfqBoNjYJE?t=63

Lesson 4 of 5: What have I learnt?

Octal Number System

The Octal number system only contains numbers from 0 to 7.

The addition and subtraction of Octal numbers are similar to those of hexadecimal and binary numbers.