Subsets of Numbers

Natural numbers, big or small Include no zero among them all Including numbers 123 Excluding fractions, as you can see Whole numbers are one step up Add a zero, and add them up To get a simple 0 1 2 There is almost nothing new Integers now are number three As negative as numbers can be Like -1 , or -93 But spanning to infinity Rational covers all before Add decimals and you’re near the door With fractions now, you’re almost done 8.3, 9 over 1 Real numbers are the final step With any number you could think up Excluding that which don’t exist Now go away, I need my rest