Post #4460563
2025-10-24 13:58 UTC
@wipfli@mastodon.social
Same here in Germany in the 1970s.
You count upward from the 4 in 384 until you get to 3, and when crossing the 0, you add 1 to the 8 in 384 and write down 9 as the last digit of your result.
Repeat for the 8+1 in 384 until you get to 7, add 1 to the 3 in 384 and write down 8 as the second-before-last digit of your result.
Repeat for the 3+1 of 384, add 1 to the 0 that is the fourth-from last digit of 384, write down 7 as the third-before-last digit.
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Replies (1)
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@gnaddrig@mastodon.social 2025-10-24 14:00
@wipfli@mastodon.social .../ Then you count up from 0+1 in 0384 until you get to 2 (as the fourth-before-last digit of 2173) and write down 1 as the fourth-before-last digit of your result which now reads 1789. Never heard of the borrowing method. But looking at your screenshot, it is the same only they other way around - we add to the number being subtracted, they subtract from the number from which you want to substract.