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RE: Arithmetic Trick: Multiplication by division of 2
That's too long of a way. I like your "15" better. I think with this one if someone knows what 9x6 is then they are sure to know 9x2 (carrying the "1"). To me, this seems like it would be more confusing.
Maybe, for instance, the first one 9x12. Just do 9x10 then 9x2, add those together. The 5x22 could be 20x5 + 2x5 or 10x5+10x5+2x5. That seems easier to me.
Nice explanation buddy! Thanks a lot for your nice comment. I like the way of your multiplication. Thanks for sharing buddy!