Classifying Real NumbersOnline version This will help to identify and classify real numbers, including both rational and irrational numbers. by Melanie Johnson 1 Natural Numbers 2 Negative Integers 3 Rational Numbers 4 Irrational Numbers 1 53 23 89 19 4 -1 -15 -8 -25 -156 2/3 0.89 -2.5 4.44444... -0.252525... -4/5 8.979779177... 3.14159265359... square root of 2 4(pi) square root of 20 cube root of 36