Similarly the ½ in the formula for the of a mass m with velocity v, ½ mv 2, has no bearing on the number of significant figures in the final calculated kinetic energy. Exact mathematical quantities like the π in the formula for the with radius r, π r 2 has no effect on the number of significant figures in the final calculated area.
Main article:As there are rules for determining the number of significant figures in directly measured quantities, there are rules for determining the number of significant figures in quantities calculated from these measured quantities.Only measured quantities figure into the determination of the number of significant figures in calculated quantities. Numbers can also be rounded merely for simplicity rather than to indicate a given precision of measurement, for example, to make them faster to pronounce in news broadcasts. For example, it would create to express a measurement as 12.34525 kg (which has seven significant figures) if the scales only measured to the nearest gram and gave a reading of 12.345 kg (which has five significant figures). The more sophisticated scientific rules are known as.Numbers are often to avoid reporting insignificant figures.
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