Like all animals scorpions need food. Crickets are mostly used but roaches, grasshoppers and all kinds of other   insects will work as well. My scorpions prefer crickets. I feed all scorpions once a week. The scorplings get 2 small crickets and the (sub)adults get 2 or 3 larger crickets.

Make sure you remove any leftover bits and pieces of the cricket to prevent problems like mites. If you have a lot of mouths to feed it might be a good idea to buy crickets in large amounts of breed them yourself. I keep my crickets in large containers on egg cartons with some patatoe. This is enough to keep them alive and let them grow.