Finding the remainder from a division calculation is often referred to as using the MOD function, though this isn't available directly on the fx-991ES.
To obtain the remainder, for example when dividing 10 by 7, you can only divide 7 into 10 once, leaving a remainder of 3.
For
larger numbers, eg when dividing 389487 by 31 (equivalent to 389487MOD31) the division gives an answer of 12564.09677 (on the display), however you only want the
fractional part so subtract 12564 to give 0.0967741935 . This includes
the lower value digits that were previously hidden. Then multiply this
result by 31 which gives 2.999999999 on the display. Since the result
of a MOD or remainder calculation involving integers has to be a whole number, the answer needs to be
rounded to 3. If the answer doesn't easily round to a whole number, it
is likely that you have gone beyond the calculator's working capacity.
An
alternative method which avoids the rounding of the fractional part is to take the integer part of the first result
(12564) and multiply it by 31 to get 389484, then subtract this from
389487, giving the answer of 3.
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