How fraction simplifier works
A fraction is in simplest (or lowest) form when its numerator and denominator share no common factor other than 1. Simplifying a fraction means dividing both parts by their greatest common divisor (GCD). For example 8/12 simplifies to 2/3, because both 8 and 12 are divisible by 4.
This simplifier computes the GCD of the numerator and denominator using the Euclidean algorithm and divides both by it. It always keeps the sign on the numerator (so 3/-9 becomes -1/3, not 1/-3) and recognises whole numbers: 6/3 simplifies to 2/1 and is flagged as the whole number 2.
Enter an integer numerator and denominator and click Simplify. The tool returns the reduced fraction and notes whether it equals a whole number. Use it for school homework, recipe scaling, and any time you need a fraction in its cleanest form.