Numbers puzzles

[Neutron]

An elderly friend is in a nursing home and asked me to find him number puzzles to amuse him and others there. He recalls a puzzle where the answer always is 7.(He thinks one has to take numbers from one's birth date, etc, add up and subtract them.)
If anyone knows this puzzle or another others like it (easy ones!) I'd be grateful, on his behalf.
(It must be pretty boring being 85 and in a nursing home, I'm sure!)
Thanks in advance,
Neutron

[shaneystar2]

Something like this
http://www.abcteach.com/directory/fun_activiti es/puzzle_fun/number_puzzles/
or ...Sudoko is good for keeping the mind active
They go from easy to completely devilish and there are loads in the daily papers or you can buy books of them.I never used to like them but am hooked now ..only the easyish ones though !!

[Neutron]

Thanks shaneystar2, I will look up the site.

The old gent isn't up to doing Sudoko nowadays.
Come to that, neither am I!

Thanks again.