CalcVind

Fraction Calculator

Add, subtract, multiply and divide fractions

Your Fractions

First fraction
Second fraction

Top is the numerator, bottom the denominator. For a mixed number like 1¾, enter 1 as the whole number.

Answer

23/20Simplified
1 3/20Mixed number
1.15Decimal
115%
Percentage

Steps

  1. 3/4 + 2/5 = (3×5 + 2×4) / (4×5) = 23/20
  2. 23/20 is already in lowest terms
  3. As a mixed number: 1 3/20
  1. 1
    Enter two fractions
    Whole numbers are optional
  2. 2
    Pick + − × or ÷
    Any of the four operations
  3. 3
    Get the answer
    Simplified, mixed and decimal

Fraction rules

To add or subtract, give the fractions a common denominator. To multiply, multiply straight across. To divide, flip the second fraction and multiply.

a/b + c/d = (ad + bc) / bd

a/b × c/d = ac / bd

a/b ÷ c/d = a/b × d/c = ad / bc

Simplifying a fraction

Divide the top and bottom by their greatest common factor. 18/24 simplifies to 3/4 because both 18 and 24 divide by 6.

Mixed numbers

A mixed number like 2⅓ is a whole number plus a fraction. As an improper fraction it is (2 × 3 + 1)/3 = 7/3. The calculator converts both ways for you.

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Frequently asked questions

How do you add fractions with different denominators?

Multiply each fraction to a common denominator, then add the numerators. 3/4 + 2/5 = 15/20 + 8/20 = 23/20 = 1 3/20.

How do you divide fractions?

Keep the first fraction, flip the second, and multiply. 3/4 ÷ 2/5 = 3/4 × 5/2 = 15/8.

How do I enter a negative fraction?

Put the minus sign on the numerator (−3 and 4 for −¾), or on the whole number for a mixed number.

Last reviewed: October 2026