Using only four 8's and only addition, subtraction, multiplication, and division.. how can you come up with the number 24? You may use fractions and decimals! But remember, you can ONLY USE four 8's
The 24game solver found here couldn't find any solutions with 4 8s. I don't think the software uses decimals to create 8.8 etc but its hard to see how that path leads to a solution. The other solution is as friedo suggests (88-8*8).