Your kids need a reason to convert fractions to decimals? Or decimals to fractions? Here's a fun activity to get your kids psyched to do this: on one side of the page there are mixed numbers (whole numbers and fractions) that have to be converted to decimals so that the amount can be entered on the gas pump. There are "easy" examples with common terminating fractions, as well as "harder" examples where the decimal has to be calculated to the nearest 10,000th in order to be rounded off to the nearest thousandth.
On the other side of the page, the students take the decimal and turn it into a fraction in lowest terms. Yes, there is an answer sheet for you, thanks, you're welcome.....
Good for assessment as well; especially because I enclosed an answer key for easy marking!
I've also made some "DIY' pages where your students can make their own riddles for one another.