Light posting today, but since I'll be mentioning alphametics in an upcoming post I thought I'd give you something to chew on while you're waiting.
In 1924, the great Henry Dudeney published the following puzzle in the Strand Magazine:
S E N D
+ M O R E
M O N E Y
Each letter here represents a digit 0 through 9. If you substitute in the proper digits, the first two numbers (words) should add up to the third.
No one who reads this blog should have any trouble with this, but if you do, Wikipedia has a good step-by-step solution (though it does assume a passing acquaintance with number theory).