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a child today might reason that 5 is half of 10, and 88 times 10 is
880, so 88 times 5 is half of that, 440 -- poof, no pen, no paper.
How do they teach multiplication of 88 by, say, 7?
It was in the second grade that I finished up a one and two digit
exercise in addition and decided to go back and repeat the problems
with subtraction instead of addition.
This was just to fend off boredom.
When I came to the somewhat unexpected 'problem' of subtracting seven
from four - I just made up a new notation - the answer is clearly
'three in-the-hole' so I wrote down the three and drew a circle
around it to signify 'in-the-hole'.
I had written down the 'correct' addition answers so the teacher
wasn't bothered too much with the extra scribbling.