You can try to subtract the first few digits that are displayed from the answer, but note that calculators work to a limited precision so you may not be able to get much more than 10 to 12 digits this way and if the decimal has more than 12 digits you will not be able to find all the digits. The only solution is to do the long division (by hand, using the digits displayed by the calculator, but when you run out of digits in the calculator, you can start a new division using the remainder so far to continue for the next few digits). Alternatively, find a calculator which works to more precision.