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Balance of Halves

Age 7 to 11 Challenge Level:
We've had one way of doing it using a weight on the $\frac{1}{2}$ peg. How could you balance 7 using $1\frac{1}{2}$? Can you carry on going along the balance like this trying the "half numbers" in turn?

How will you make a note of what you have done?

How will you know that you have got all the different ways?