Casting out nines

Posted by R. Berg July 04, 2009 at 16:25In reply to Casting out nines posted by Susan Durisoe on July 03, 2009 at 20:30:

My mother just asked me a question I couldn't answer. What does the phrase "casting out nines" mean?

Casting out nines is a way of checking your arithmetic.

Link below: en.wikipedia.org/ wiki/Casting_out_nines

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