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4:35
This video shows a very simple, straight forward method of checking multiplication. It is simple to use this method to check both small and large calculations using mental arithmetic. It provides a 100% proof that a calculation is wrong and a strong indication it is correct. The method can be adapted to check division. I'll post an explaination if needed.
4 Dec 2006
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0:52
An easy way to learn and remember the nines multiplication table.
5 Mar 2007
3024
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