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How to calculate the head and tail of mathematical multiplication
Mantissa multiplication = the last two digits of the result, 1x9 is 09;

The first number x (the first number+1)= the first two digits of the result.

Example:

5 1*59: The first two digits are 5*(5+ 1)=30, and the last two digits are 1*9=09, and the result is 3009.