This week, I trained new teachers how to make lessons for the Promethean IWBs we have at school.
There are several features you can use and one of them is hiding/showing. A friend of mine , Rita, sent me a message yesterday asking for help because she wants to prepare an activity where she hides images behind numbers.
This is a tutorial I've made to show her how to do it.
The same software can be used in other IWBs, all you have to do is download the free version of ACTIVINSPIRE from http://www.prometheanplanet.com/en-gb/support/