Answers

2015-01-18T20:57:01+08:00
It can be ...
rational    e.g.{-1, 0, 1/2, 1}
Irrational     e.g.{square root of 2, pie}
integers  e.g.{ -1 , 0 , 1 }
non-integers e.g. {1/2, 1/4}
negative numbers  e.g. {-3, -2, -1}
whole numbers { 0,1,2}
zero {0}
positive numbers {1,2,3,4}
0