Real Numbers can also be positive, negative or zero. In mathematics, a real number is a value of a continuous quantity that can represent a distance along a line. The type of number we normally use, such as 1, 15. Watch this video to understand what Real Numbers are! To access all videos on Real Numbers. Real numbers are numbers comprising rational and irrational numbers. 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.