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Find the Difference

Age 5 to 7 Challenge Level:

Place the numbers $1$ to $6$ in the circles so that each number is the difference between the two numbers just below it.

6 circles
Example:   $5 - 2 = 3$

You could try it in this interactivity.


When you have tried this and got more than one answer you could try other things like having four rows of discs and use the numbers $1$ to $10$.