After completing this lesson, student must be able to:

- Describe octal number system.
- Explain decimal and binary number.
- Define hexadecimal number system and binary arithmetic.

The number of base or radix ten is called decimal numbers. Similarly, Binary Number is a number of two base numbers.This note provides an information about Decimal and Binary Numbers.

The number with base eight is called octal number. We can generate these numbers with the combination of 0, 1, 2 3, 4, 5, 6, 7. This note provides an information about Octal Number System and its conversions.

The number with base sixteen is called hexadecimal number. We can generate these numbers with the combination of 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A,B, C, D, E, F. Where A=10, B=11, C=13, D=14, E=15, F=16. This note provides an information about Hexadecimal Number System and Binary Arithmetic.