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 Hint
- To make the sum large, put
in the thousands place and put  ,
 ,  ,
and  in the
ones place.
To make the sum small, put
in the thousands place and put  ,
 , 
and in
the ones place.
To get a sum close to 2000, put
in the thousands place and try combinations of digits that add
to 8 or 9 in the hundreds place.
To get a sum of 9000, put
in the thousands place and try combinations of digits that add
to 10 or 20 in the ones place.
- The sum of the four corner numbers must be 23, and either .
or must be
put in one of the four corners.
Back to Nabu's Knee-knocker
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