Take turns to choose a mystery number and give three clues. It will help your child if they write out all the possible numbers first and cross off numbers as they get each clue. We have deliberately made our last clue very helpful, but you can make your clues more challenging. Keep using our comparative vocabulary, for example, "more than", "less than" or "equals". You could also include clues to revise other topics, for example, odd and even numbers.