Question

Show that 28^n cannot end with 0 for any natural number

Answer 1

28*2 cannot end with zero as for any natural number 28 will be multipied by 28. The number of times week serious on the value of 'n'. As the first digit is 8 and 8×8 is 64 therefore the answer should end with 4 and not 0.
remember,
28
× 28
-------
224
+ 560
------------
784
------------