Fraction calculator
Plain fractions like 3/4, mixed numbers like 1 1/2, whole numbers like 5, and decimals like 0.75, which is converted to 3/4 before the sum. Answers come back fully reduced, so 2/4 + 2/4 is 1 rather than 4/4.
To add or subtract fractions, put them over a common denominator, combine the numerators, then reduce. To multiply, multiply across the top and the bottom. To divide, flip the second fraction and multiply. Every answer here is reduced by dividing both parts by their greatest common divisor.
How to use it
Reducing is the step people skip and teachers mark down. Adding 1/6 and 1/3 gives 3/6 before reduction, and 1/2 after it. Both are the same quantity, but only one is the answer as it is normally written. The greatest common divisor is found here with Euclid’s algorithm, which is the same method by hand: divide, take the remainder, repeat until it is zero.
Questions
Yes. A whole number is read as itself over one, so 5 − 1/4 gives 19/4, shown as 4 3/4.