One identifying characteristic of real numbers is that they can be represented over a number line. Think of a horizontal line. The center point, or the origin, is zero. To the right are all positive numbers, and to the left are the negative points.

How do you know if a number is real in math?

1. The Real Numbers Include Integers, Rational, and Irrational Numbers. …
2. The Number Line Contains all the Real Numbers (and Nothing Else) …
3. Every Real Number Has a Decimal Representation. …
4. Real Numbers Can do Arithmetic. …
5. There Are Numbers That Are Not Real.

What is a real number example?

Real numbers include rational numbers like positive and negative integers, fractions, and irrational numbers. … This indicates that real numbers include natural numbers, whole numbers, integers, rational numbers, and irrational numbers. For example, 3, 0, 1.5, 3/2, √5, and so on are real numbers.