what is an example of a number that is a real number, rational number, and integer
:D Well don't be irritated, in algebra, A real number is any number (actually there are such an imaginary number, and complex number, these numbers are excluded!). It can be a whole number, an integer, a fraction, a decimal number, a rational number or an irrational number. A whole number is any number which is not a fraction or a decimal number, examples are 1, 2, 7, 89. It is always an integer (traditionally it refers only to positive, however there is an ambiguity if it includes the negative) and a rational number.