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* * * Denominators can't be zero. * * * Denominators can't be greater than 25. * * * Each fraction must have both the numerator and denominator box filled in, otherwise this creates an error message and nothing is calculated. For practice, input 3/4 2/3 and 1/12 as shown: 
The 2 rows beneath the calculate button will now look like this:  Boxes 1, 2 and 3 show the fraction being reduced. Boxes 4a and 4b show the fraction as a whole number with its fractional part, which in this example is 1 ½ So, this calculator determines the common denominator, shows what each fraction becomes, shows the sum of the numerators over the denominator, reduces the fraction to simplest terms and puts the fraction into the "whole number plus a fraction" form.
When subtracting a fraction, put a minus sign on the numerator or
denominator - but not BOTH.
NOTE: If the answer is less than zero, boxes 4a and 4b will NOT be filled in
due to the confusion caused by trying to show 1 negative number in 2 boxes.
Good luck with those fractions !!!
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