The students numbered 1 to 8 should sit on the chairs so that no two consecutively numbered students sit next to each other either vertically, horizontally or diagonally.
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Transum.orgThis web site contains over a thousand free mathematical activities for teachers and pupils. Click here to go to the main page which links to all of the resources available. Please contact me if you have any suggestions or questions. 
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Numeracy"Numeracy is a proficiency which is developed mainly in Mathematics but also in other subjects. It is more than an ability to do basic arithmetic. It involves developing confidence and competence with numbers and measures. It requires understanding of the number system, a repertoire of mathematical techniques, and an inclination and ability to solve quantitative or spatial problems in a range of contexts. Numeracy also demands understanding of the ways in which data are gathered by counting and measuring, and presented in graphs, diagrams, charts and tables." Secondary National Strategy, Mathematics at key stage 3 

Go MathsLearning and understanding Mathematics, at every level, requires learner engagement. Mathematics is not a spectator sport. Sometimes traditional teaching fails to actively involve students. One way to address the problem is through the use of interactive activities and this web site provides many of those. The Go Maths main page links to more activities designed for students in upper Secondary/High school. 

Do you have any comments? It is always useful to receive feedback and helps make this free resource even more useful for those learning Mathematics anywhere in the world. Click here to enter your comments. 
Paul, Birmingham
Monday, March 26, 2012
"Can anyone solve this I'm still puzzled!
[Transum: Here's a clue Paul. The numbers one and eight are different from the other six numbers as they only have one number consecutive to them. Perhaps they should go in the chairs that have the most neighbours!]"
Transum,
Monday, September 12, 2016
"Teachers: When this activity has been completed use the created arrangement of numbers to ask the revision questions on this page Not Too Close Questions."
Harry, Ho Chi Minh City
Friday, January 25, 2019
"It's quite simple because when you know where 1 and 8 goes you can easily figure out the rest."