Stand up, hand up, pair up. Ask your partner to solve one of the sums on your grid. If you agree with their answer, record it and write their name (with a capital letter!). If you disagree, see if you can persuade them. DON'T write down an answer you think is incorrect. Thank your partner and answer one of their questions before finding a new partner. If you have filled in all of the boxes, return to your desk so students know they can ask you the answers.
Students had to find a friend who could find half or quarter of a collection. They asked a friend to solve one of the sums. If they agreed, they recorded the answer and wrote their name down. This is a Kagan cooperative learning structure.