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We started with this pentagon.
Added a triangle:
Then another one:
What would come next, and why?
Can you invent something like these for your friends to solve?
What is the greatest number of squares you can make by overlapping three squares?
Find all the numbers that can be made by adding the dots on two dice.
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?