Fraction Calculator

No. 2 — TWO FRACTIONS, ONE ANSWER
AD SLOT — TOP — replace with ad unit / affiliate banner (e.g. AdSense, Amazon)

Enter two fractions to combine them.

+ =
56 RESULT
(1 × 3 + 1 × 2) / (2 × 3) = 5/6
decimal ≈ 0.8333

How the math works

Add or subtract fractions

Rewrite both fractions over a common denominator (the product of the two denominators works every time), then add or subtract the numerators.

a/b + c/d = (a·d + c·b) / (b·d)

Multiply fractions

Multiply the numerators together and the denominators together. Then simplify.

a/b × c/d = (a·c) / (b·d)

Divide fractions

Keep the first fraction, flip the second one upside down (the reciprocal), and multiply.

(a/b) ÷ (c/d) = (a/b) × (d/c) = (a·d) / (b·c)

Frequently asked

Should the denominator ever be zero? No — a fraction with a denominator of zero is undefined. Enter non-zero denominators.

How do you simplify? Divide the top and bottom by their greatest common factor. 8/12 becomes 2/3 because 8 and 12 share a factor of 4.