What if the answer is negative?

That's fine — enter either number as negative (e.g. "-3/4") or subtract a larger fraction from a smaller one; the calculator handles negative results and shows the sign on the numerator.

Subtracting Fractions Calculator (Shows Steps)

Subtracting fractions works like adding them: convert both to a common denominator first, then subtract the numerators. This calculator shows the common denominator, both conversions, and the simplified answer.

First numberOperationSecond number

Enter a whole number (3), a fraction (3/4), or a mixed number (1 1/2).

1 1/2 − 2/3 = 5/6

Find a common denominator: 2 and 3 → 6
Convert 3/2 to 9/6
Convert 2/3 to 4/6
Subtract numerators: 9 − 4 = 5
5/6

How it works

Find the least common denominator (LCD) of both fractions.
Convert each fraction so it has that denominator.
Subtract the second numerator from the first; keep the denominator the same.
Simplify the result, and convert to a mixed number if it's improper.

Frequently asked questions

What if the answer is negative?: That's fine — enter either number as negative (e.g. "-3/4") or subtract a larger fraction from a smaller one; the calculator handles negative results and shows the sign on the numerator.