After completing this lesson, student must be able to:

- Convert Decimal to Binary.
- Convert Binary to Decimal.
- Describe the rules for binary addition and binary multiplication.
- Describe the number system.
- Know about equivalent values for different number systems

Number system can be defined as the combination of different numbers which helps in the calculation. This note provides an information about number system.

You have to learn addition, subtraction, multiplication, and division of binary number. In brain, you have to keep that in the arithmetic of binary number, carry is written in binary (2) just like as 10 is used in decimal system for carry. This note provides an information about binary arithmetic.