just change the fration with the smallest denominator and add or subtract the way you always do.
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the fractions have different denominators
First you would want to change the mixed number to an improper fraction. Then you can subtract
To add or subtract mixed numbers, first convert them to improper fractions. Then, perform the addition or subtraction operation on the numerators while keeping the denominators the same. Next, simplify the resulting fraction if possible by reducing it to lowest terms. Finally, if needed, convert the improper fraction back to a mixed number for the final answer.
First convert the mixed numbers into "top heavy (or "improper) fractions". Now multiply each of the improper fractions by each other - this makes the denominators the same. Now you can add both the fractions together (and cancel down if necessary).
Convert them to improper fractions with common denominators and proceed normally.