Vedic maths …one line solution
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first we find the difference of the numbers from 100 .
(100 -97) = 3
Similarly , (100-94) = 6
we cross subtract
94-3 = 91
97-6 = 91 (therefore 91 are the first two digits )
then we multiply the differences (6 x 3) = 18 (now 18 is the next two digits)
so, 97 x 94 = 9118