This is an old activity from ELS. - Early literacy support.
I use it a lot because it helps make learning sounds a bit more fun.
Very simple to do. Have a stack of grapheme cards. The first clap rap is showing a letter to the children and they have to shout out the sound. The second clap rap is saying the sound without showing the letter to see if they can write it down,
Right click and copy the poster below to download it.