✔  Odd 
Even 
Multiple of three 
Prime 

Square 

Factor of 168 
Place the numbers 1 to 9 in the table so that they obey the row and column headings.
1
2
3
4
5
6
7
8
9
Here is a slightly more difficult version.
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✔  Odd 
Even 
Multiple of three 
Prime 
5 
2 
3 
Square 
1 
4 
9 
Factor of 168 
7 
8 
6 
Are there any other ways of placing the numbers?
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