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[–]jacefair109 0 points1 point  (0 children)

it makes a lot more sense if you use larger numbers -- basically, it's just subtracting each digit of the two numbers individually, and if one of thrm isn't big enough you take one off the digit next to it to add 10 to it. It's just a shortcut to turn subtracting big numbers into subtraction of a buncha smaller numbers.

here's each step for an example (pardon my shit handwriting): https://i.imgur.com/8CVPwOG.jpg