Number magic: not actually magic

A thing I've seen around the internet is "if you add your age to the last two digits of your birth year, it is 111! magic!" - I've tried explaining why this isn't magic, but haven't made it as simple and clear as nbisby on the opera blog. To paraphrase:

The magic where you have a ring of numbers, and no matter where you start the instructions always have you finish in the same place, use similar cancelling-itself-out tricks :3

2011-05-26 01:20:23 -0500
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