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Number System
Numbers along with arithmetic operators.

Number
Concept of counting or measuring. example 4 cows, 6 trees.

(a) Natural Numbers (N)
Numbers of the type 1, 2, 3, 4 ...

(b) Whole Numbers (W)
Numbers of the type 0, 1, 2, 3, 4 ...

(c) Integers (Z)
Numbers of the type ... - 3, - 2, - 1, 0, 1, 2, 3, 4 ...

(d) Rational Numbers (Q)
A number of the type p/q where p and q are integers and q ≠ 0.

(e) Irrational Numbers (I)

A (Real) number ‘i’ is called irrational if it cannot be written in the form p/q
where p and q are integers and q ≠ 0.

(f) Real Numbers (R)
Combination of real rational and irrational numbers

(g) Complex Numbers (C)
Numbers of the form a + bi where a, b are real numbers and i = squareroot - 1

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