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*Introduction to Number system:*

*1. A Unit is something that denotes a single thing. Such as: A day, a meter etc.*

*2. A number denotes how many times a unit is taken. Ex: Rohit has Four pens.*

*3. A numeral is a symbol representing a number.*

*4. Numeration is expression in words of a number written in figure.*

*5. Place value: When a number consists of more than one digits each digit of the number has a value according to its position in the number.*

*6. Face value: each digit in a number has a fixed value regardless of its position in the number.*

*7. Real numbers: Whole nos, Integers,decimal nos., Rational nos, irrational nos, etc.,*

*8. Binary digits also comprises of the number system.*