The number system is classified into sets. Different types of numbers have different types of uses. You get natural numbers, integers, rational numbers, real numbers and complex numbers.
Natural numbers are the most familiar numbers. It is also called whole numbers or counting numbers. It is numbers like 0; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10. The mathematical symbol for natural numbers is N.
Integers are positive and negative numbers. It can be defined as a number that produces 0 when it is added to the corresponding positive integer. For example -5 +5 = 0. A negative sign is used to indicate that the number is a negative number. The mathematical symbol for integers is Z.
-10; -9; -8; -7; -6; -5; -4; -3; -2; -1; 0; 1; 2; 3; 4; 5; 6; 7; 8; 9; 10
Rational numbers can be expressed as a fraction with an integer numerator and a positive integer denominator. Negative denominators are commonly being avoided because every rational number you get is equal to a fraction with a positive denominator. The mathematical symbol used for rational numbers is Q.
Example: (a on b) where a and b are integers and b is not 0
Real numbers include all the measuring numbers. Usually real numbers are represented by using decimal numerals. The decimal point is placed to the right of the digit. The mathematical symbol of real numbers is R.
Complex numbers arose from trying to find closed formulas for the roots of cubic and quartic polynomials. Real numbers can be extended to the complex numbers. The mathematical symbol for complex numbers is C.
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