Quote:
Originally posted by mattdavis11
I do it all the time when I have to do it in my head. Seems easier sometimes to multiply 6x60 and add on the twelve to get 372.
If I was asked what 15x17 was, it's easier knowing that 15 squared is 225, I then add 30 to it to get my answer.
Maybe that's the approach they have in mind, only using your mind.
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Exactly. It's a better foundation for actually learning "formulas" vs the old multiplication drills that only taught you to memorize the answer.
For me it's not 15x17, it's 300-45. I "see" 15x20-3x15.
Ever watch people try to make change? You can tell the ones that have been taught to calulate vs memorize.