To express a number as a higher or lower figure, as by eliminating all or some of the decimals from a fraction or by writing the number as a multiple of 10. A noun or pronoun can be used between "round" and "off." For the sake of simplicity, just round off to a whole number before entering the figure into the calculation. These larger companies tend to round off to the nearest million or hundred-thousand when reporting their sales figures to the public. Because the fraction 1/3 is infinitely repeating, we normally just round off to 0.33.