## Thinking Mathematically (6th Edition)

Natural: $\sqrt 49$ (because the square root of 49 is 7) Whole: 0, and $\sqrt 49$ Integers: -7, 0, $\sqrt 49$ Rational: All the integers listed above plus -7 and -0.6 (with the bar over the six) Irrational: $\sqrt 50$ Real: All numbers listed above.