This free online calculator will add one mixed number to another, or subtract one mixed number from another  regardless if the two mixed numbers have the same or different denominators  and give the resulting fraction in simplest form.
Plus, unlike some other online mixed number calculators, this calculator will show its work and give a detailed stepbystep explanation as to how it arrived at the result.
The only difference between adding or subtracting mixed numbers and adding or subtraction fractions, is that before you begin to add or subtract you must first convert the mixed numbers to improper fractions.
To convert a mixed number to an improper fraction, you first multiply the denominator of the fractional portion by the whole number and then add that product to the numerator. That result then becomes the numerator (top) of the improper fraction, while the denominator (bottom) remains unchanged.
2  1  =  3 x 2 + 1  =  7  
3  3  3 
Once you have converted the mixed numbers to improper fractions, you simply add or subtract the fractions as usual (the calculator will show its work in case you're not sure of the steps involved).
With that, let's use the Adding Subtracting Mixed Numbers Calculator to add one mixed number to another, or to subtract one from the other.

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