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Let's say you're working with the following problem: 5 - 3/4. Write it down. You'll want to convert the number 5 into a fraction with the denominator of 4 in order to subtract the two numbers. So, you can first think of 5 as a fraction that is really 5/1. Then, you can multiply both the top and bottom of the new fraction by 4 in order to create two fractions with the same denominator. So, 5/1 x 4/4 = 20/4. This fraction is really equal to 5, but it allows you to subtract two fractions. The new problem can be written like this: 20/4 - 3/4. Now, you can simply subtract 3 from 20 to get the final answer. 20 - 3 = 17, so 17 is your new numerator. You can keep the denominator as it is. Your final answer is 17/4. If you'd like to state it as a mixed number, simply divide 17 by 4 to get 4, with 1 left over as the remainder. This will make your final answer 17/4 equal to 4 1/4.
Write down the problem. Turn the whole number into a fraction with the same denominator as the fraction. Rewrite the problem. Subtract the numerators of the fractions while keeping the denominator the same. Write your final answer.