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One to Fifteen

Stage: 2 Challenge Level: Challenge Level:1

Which circles lie on the fewest straight lines? How might this help?
If you try putting the number $1$ on one circle, where could you put the $2$? Now, where could the $3$ go?
You could use the interactivity to try out your ideas.
You could print off this picture of the circles and use numbered counters to solve the problem, or use a pencil to write numbers in the circles.