The Remainder reference article from the English Wikipedia on 24-Apr-2004
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Remainder

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The remainder is the value left over in an integer division problem.

For example:

13 / 10 = 1 R 3 where 1 * 10 + 3 = 13 and 3 is the remainder

35 / 10 = 3 R 5 where 3 * 10 + 5 = 35 and 5 is the remainder

40 / 10 = 4 R 0 where there is no remainder