We are dealing with the fractions 4/5 and 1/2. In order to usearithmetic on them, they have to be in the same terms . . . thedenominator or bottom number must be the same in both fractions,but without changing their values.One way to get a common (same) denominator is to simply multiplythem together. Doing that (5 times 2) gives us 10. So 4/5 becomes8/10 and 1/2 becomes 5/10. Then, 8/10 minus 5/10 is 3/10, which isyour answer.