Question 66215
what are clock problems?
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They are mod 12 problems.
Look at a clock.
What is 3+5?  It's 8.
What is 8+5?  It's 1.
What is 3-5?  It's 10
These are examples of "clock arithmetic".
Hope this helps.
If you wish to get more information try using
Google and searching for "Mathworld clock arithmetic".
Cheers,
Stan H.