Once students have been shown (and understand) how a parity bit works, move on to looking at the parity Byte which will allow specific data errors to be identified. Check understanding by creating your own parity exercise (using the spreadsheet) to double check the maths and then get the students to create their own parity puzzle which they can then swap with a partner for their partner to check and find the error.
The first time through, I ask the students to specify the type of parity used when creating the puzzle.
The second time through, I ask the students to keep the type of parity they used to themselves (so that their partner has to work this out themselves)
The third time, I ask the students to add more than one error to see if there can also be detected.