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Cut out the square and the two pieces and try to make some shapes. (You could print off this sheet which contains four copies of the square.)
How will you record your findings?
How do you know you have found all the shapes?
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?