Amazing Math Check

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This video shows a very simple, straight forward method of checking multiplication. It is simple to use thi...
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.
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