Real Number System

The real number system includes all numbers used for counting, measuring, and comparing quantities. Natural numbers are the basic counting numbers: 1, 2, 3, and so on. Integers expand this set by including zero and negative whole numbers: ..., –3, –2, –1, 0, 1, 2, .... Rational numbers are those that can be expressed as the ratio of two integers...

The real number system includes all values that can be placed on the number line, including both rational and irrational numbers.

Rational numbers include values that can be written as fractions. For example, cutting a fruit into two equal parts gives one-half, a rational number. These also include negative fractions, like negative three-f...