A Mathematics Riddle?

Matt

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We had a bludge lesson in class today (hooray) so we decided to solves some riddles.
One of these was, When does 12+10=10
Apparently the answer was 2, which the teacher told us when none of use understood it (including the teacher).
The only answer I can think of is in relation to a clock face but that doesn't fit if the answer is 2.

Help?
 
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