Find My iPhone app by apple is a way to track any misplaced iOS Device or Mac OS 10.7 system. When setup and on an active internet network you can find a misplaced iPad by location using another iOS Device or Mac 10.6 & above computer with The Find My Phone app.
To Turn on Find My Phone. The iPads must have a valid classroom Apple ID signed into iCloud on the iPad and the Find My Phone feature must be on. Once this is done install the Find My Phone App on a single iPad or Mac computer to locate, Send a message or sound, lock or even wipe the data from the iPad.
Please consider setting up this App on your classroom iPads as a form of security. Devices with a security system on them are more likely to be recovered.
iPad Find my iPhone app Link.