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A trick to multiply 2-digit numbers.
A trick to multiply a number by 11.
A trick to multiply a number by 9.
A trick to multiply 3-digit numbers.
A trick to multiply a number by 5.
A trick to form table of any 2 digit number.
A trick to form table of 19.
To check the divisibility of any number by 7.
A trick to multiply any number by 9, 99, 999, ... and so on.
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