Yes this can be made generic; Approach: 7*x=(8-1)*x= 8*x-1*x=x<<3-x

Give a fast way to multiply a number by 7

Question Posted / pratik chopra

Answer Posted / pratik chopra

Yes this can be made generic;
Approach: 7*x=(8-1)*x= 8*x-1*x=x<<3-x

If 6*x=(4+2)x=4*x+2*x=x<<2+x<<1
If 13*x=(16-2-1)x=(x<<4-x<<1-x)

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