An Egyptian fraction is a fraction expressed as the sum of distinct unit fractions. All fractions are Egyptian fractions. Simply enter the numerator and denominator of a fraction and it will turn it into simplest form, then spit out denominators of the unit fractions required. Example: Enter numerator 21, denominator 51. It displays simplest form by finding the LCM, then the GCF. It gives you also 3, 13, and 663. Check: 1/3+1/13+1/663 = 7/17. Just don't enter something too big, because then it has to multiply them together, and it bugs to infinity.