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Subtracting Fractions Calculator

Subtracting Fractions Calculator

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This calculator finds a common denominator, subtracts the numerators, and simplifies the result, e.g. 3/4 − 1/6 = 7/12.

Subtracting fractions follows the same setup as adding them — find a common denominator first — but with the added wrinkle that the result can come out negative if the fraction being subtracted is larger. Enter two fractions here and this calculator converts both to their least common denominator, subtracts the numerators, and simplifies the result, showing a minus sign when appropriate. The decimal equivalent is shown alongside the fraction for an easy double-check.

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  • How subtraction works: convert both fractions to the least common denominator, subtract the second numerator from the first, then simplify.
  • The result can be negative if the second fraction is larger than the first — the sign is shown on the numerator.
  • The result is always shown fully simplified, along with its decimal equivalent.

How do I subtract fractions with different denominators?

Find a common denominator, rewrite each fraction over it, subtract the numerators, and simplify.

What is 3/4 − 1/6?

The LCM of 4 and 6 is 12: 3/4 = 9/12 and 1/6 = 2/12, so 9/12 − 2/12 = 7/12.