Rational Numbers

Different sets of numbers can be represented by lists of their members. For example:

Natural or counting numbers: N = {1,2,3,4...} Whole numbers: W = {0,1,2,3,4...} Integers: Z = {... -4,-3,-2,-1,0,1,2,3,4...}

The sets N, W, and Z, can also be shown on a number line. Remember that 0 is known as the origin and is neither positive, nor negative. Numbers to the right of 0 are positive, and those to the left of 0 are negative.