Not a programming problem! but need help

last week my teacher taught us some addition and subtraction of binary, decimal, hex and octal number. and it's quite easy. but the last topic for me seems to be hard. MULTIPLY AND DIVISION of number system.
can anybody point me out to some text or link in the web pertaining to this subject
please!!

Here is one page: http://www.cut-the-knot.com/blue/SysTable.shtml
The idea is basically the same as in base 10 (you do know long multiplication and division?), only need to use the multiplication and addition tables of the correct base...

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