Math

Fraction Calculator

Add, subtract, multiply, or divide fractions with reduced and decimal results.

Inputs

Defaults are prefilled so the result is visible immediately.

First numerator

First denominator

Operation

Second numerator

Second denominator

Results

Results update as the calculator inputs change.

Reduced result

23/20

Decimal

1.15

Mixed number

1 3/20

Unreduced result

23/20

Formula and Assumptions

Fractions are combined using common-denominator arithmetic and then reduced by greatest common divisor.

The result is normalized so a negative sign appears in the numerator.

Division by a zero numerator in the second fraction is not valid.

Reference Upgrade

Built from the Calculator.net model, with added context.

Live validation and instant result updates instead of a submit-only workflow.

Multiple decision metrics are shown together, not only the primary answer.

Formula notes and assumptions are visible on the page so the math is easier to audit.

Reference Model

Modeled after the input style and primary output on Calculator.net's Fraction Calculator.

The page keeps the math in one place and exposes the assumptions beside the result.

Default inputs: aNumerator=3, aDenominator=4, operation=add, bNumerator=2, bDenominator=5