math-Practice of rational numbers, irrational numbers etc.

prime number

A Prime Number can be divided evenly only by 1, or itself. And it must be a whole number greater than 1. Example: 5 can only be divided evenly by 1 or 5, so it is a prime number. But 6 can be divided evenly by 1, 2, 3 and 6 so it is NOT a prime number (it is a composite number).

imaginary number

An imaginary number [note 1] is a complex number that can be written as a real number multiplied by the imaginary unit i, [note 2] which is defined by its property i2 = −1. The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25.

Integer numbers

An integer (not a fractional number) that can be positive, negative, or zero. Examples of integers are: -5, 1, 5, 8, 97, and 3,043.

rational numbers

In mathematics, a rational number is any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. Since q may be equal to 1, every integer is a rational number.

real number

In mathematics, a real number is a value that represents a quantity along a line. ... The real numbers include all the rational numbers, such as the integer −5 and the fraction 4/3, and all the irrational numbers, such as √2 (1.41421356..., the square root of 2, an irrational algebraic number).

Irrational numbers

In mathematics, an irrational number is a real number that cannot be expressed as a ratio of integers, i.e. as a fraction. Therefore, irrational numbers, when written as decimal numbers, do not terminate, nor do they repeat.

index number

a number used to indicate change in magnitude (as of cost or price) as compared with the magnitude at some specified time usually taken as 100.

whole numbers

is a number without fractions;and is can be an integer.