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The "times table difficulty chart" is sort of fascinating. I've always thought that 7x8 would be the hardest, but their sample set says 6x8 is. Looks like the
by quesera 12y ago
The "times table difficulty chart" is sort of fascinating.
I've always thought that 7x8 would be the hardest, but their sample set says 6x8 is.
Looks like these kids hadn't been taught the 9s-table trick, nor the "6-times even-X always ends in X mod 10" trick. OK, I made that last one up...but 6-times even-X often rhymes, which I remember finding quite useful for memorization.
Separately, I was always taught that multiplication produces "products", and addition produces "sums". Perhaps the Brits disagree.
- mercer 12y agoIn my case 6x8 is exactly the one I have trouble with. 7x8 is easy for me because in dutch it's pronounced as 'seven times eight is six five' (as we say six and fifty, like the germans). So it's basically just sequential numbers. But for some reason, in my late twenties, I still go 'six times eight is five times eight is forty plus eight is forty-eight'. Every time!
- Arnavion 12y agoThe word "sum" is used here to mean an arithmetic expression or math in general. For example, a parent might ask their child, "Have you done your sums?" to mean "Have you done your maths homework?"
- deleted 12y ago[deleted]
- pavel_lishin 12y agoThe 6-times-rhyme was a plot device in a short story I read once, where a witness remembers a license plate because it ended in 47 - which they remember, because 6x7 is obviously 47.
- chiph 12y agoThe thing I found interesting about the chart is that it's not 100% reflective along the diagonal. The 7x8 error rate is different from 8x7.
- scott_s 12y agoI'm surprised there's not higher accuracy along the diagonal. I learned the squares as a special case.