27 x 32 = 1152
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52 = 25
Think of the "ex" in index as meaning exponent. Write the prime factorization with exponents. 216 = 23 x 33
1.016 *100 but the "*100" bit is really redundant.
It is: 3*5*7^2 = 735
24 x 5 x 72 = 3920