Why do this problem?
is a good one for teaching what consecutive numbers are and for learning to spot them. It is fun to do as long as there are real objects, such as numbered counters, to move around or an interactivity to use.
Sound logical thinking is required but, almost inevitably, some trial and improvement will also be needed!
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?
Which numbers have fewer consecutive numbers than the other numbers?
If you have $12$ down, for example, which numbers are consecutive to it?
Learners could be challenged to find as many different solutions they can.
Suggest using the interactivity if at all possible as this identifies the consecutive numbers.