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Rodd has a bad cold and looking through his window, he counts the cars on a bridge. Realising that he needs to count more than 10, he has the idea of making an unusual abacus that goes up to 20 and uses toy cars instead of balls. He grabs a washing line and creates his ‘carabacus’ and invites the children to count ‘one more car’ each time, from 16. Then Rodd uses a toilet roll with numbers on as a number track to show how it can be used to find out ‘how many’ cars he has, without counting them. Then Rodd invites the children to create, in pairs, their own abacus.