A quick way to find the tens digit of $m^n$

This video presents a quick way to find the tens digit of a large number in the form of $m^n$ without using complex MOD theorems. Some examples include:

(4157) What is the tens digit of $321^{123}$?

(4158) Find the last two digits of $123^{321}$.

(4159) Determine the last two digits of $312^{123}$.



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