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It worked for 15 X 17, if you do 17 vertically and 15 horizontally (=255)
Quote:
Originally Posted by konfetka
32 X 22 worked, if you do 32 vertically (biggest number first) =704
I still am not seeing it. Can you take a picture and post it?
Quote:
Originally Posted by konfetka
I like how easy it is for numbers under 10 to do for little kids
Wouldn't you still have to know facts? We are counting intersections of line segments, right? I did 3 x 9 and had to count how many intersections there were. Unless you just give a visual and and a more concrete way to look at it.
By the time I draw lines and count intersections, I could have the answer the old fashioned way faster.
Yup.
While this will work with all numbers, it gets too cumbersome for many number combinations.
I'd be surprised if this came out of Japan though. It looks like an algorythm Everyday Mathematics would use. While this works, I doubt most adults here get why it works, let alone kids and, while the algorythm could be adjusted to do three digit numbers, it's going to be a PITA. The old fashioned way works all the time, the same way all the time and for many combinations is faster.
The advantage of this method would be that it works for someone who does not know their multiplication tables (this is why I think this did not come from Japan). If you didn't know them, then this would be faster than the old fashioned method. So this fits with math for dummies which I wouldn't expect to see coming out of Japan. That would be an American invention. We're the ones who keep dummying down math and finding tricks to answers instead of teaching to understanding.
Well, I don't understand how it works, to be honest...
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