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If a Robot Monster is going to be as tall as possible, which head will you choose? So which body and set of legs will you add?
To work out how many Robot Monsters you can make of different heights, why not start with one head and look at all the different ways you could add body and legs to it?
Andrew decorated 20 biscuits to take to a party. He lined them up and put icing on every second biscuit and different decorations on other biscuits. How many biscuits weren't decorated?