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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.
For example: 5 - 2 = 3
You could use this interactivity to try out your ideas:
Can you find more than one solution?
Can you find all the possible solutions? How do you know you have found them all?
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?