This trick is an extension of the previous trick. It empowers you to multiply two numbers that can be expressed as z|y and z|(10-y).
The result of multiplication of the two numbers is z(z+1)|y(10-y)
To illustrate by an example,
37 * 33 = 3(3+1)|7*3 = 1221 141 * 149 = 14(15)|1*9 = 210|09 = 21009
Hmm... what do you say? Isn't maths really a fun! 
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