Answer Posted / anonymous

The easiest way is to relate the number to be multiplied
by, to a power of 2. Then a corresponding number of left
shifts to that power with an addition or subtraction would
give the desired result.

In this case, 7 can be written as 2^3 - 1 or 8 - 1.
Therefore, shift the number to the left thrice which would
multiply it by 8. Then subtract the original. You can also
do this as

4 + 2 + 1 = 2^2 + 2^1 + 1

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