- Number your board according to how many problems or questions your groups are solving.
- Give each group a corresponding number of sticky notes.
- Explain to students that whenever they finish a problem, they should write their group name and answer on a sticky note. Someone should bring it to the board and post it.
- If there is already a note posted, they should compare the two answers. If their answers are different, the two groups have to partner up to determine which answer is correct and why.
This strategy can be used across content areas - whenever you have groups of any age working on answers together. I love the collaborative nature of it, with students helping peers to correct errors.