If you're lucky enough to be a millionaire, it's unlikely that you worry about whether your bank balance is £5,380,276.42 or £5,380,000.00 - the £276.42 is insignificant to you. Accuracy can, however, be very important indeed. For instance the inside diameter of car tyres must be accurate to a millimetre or so, or they'd fall off whilst driving! In many cases though, we can approximate the answers we give.
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