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Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?
Can you design a new shape for the twenty-eight squares and arrange the numbers in a logical way? What patterns do you notice?
How many starfish could there be on the beach, and how many children, if I can see 28 arms?