How do you convert 88.4 into a mixed number?

To convert 88.4 into a mixed number, you first keep the whole number part, which is 88. The decimal part, 0.4, can be converted to a fraction by placing it over 10 (since there is one decimal place). Therefore, 0.4 as a fraction is 4/10, which simplifies to 2/5. Putting it all together, 88.4 as a mixed number is 88 2/5.