How to calculate the first volume of level 3 mathematics 100-23?

100-23=77 can be placed vertically.

100

- 23

————

If you don't stand it upright. 100-23 Because 10-3=7, there is actually no ten digits, so we have to "borrow", but the ten digits have to be subtracted by two, so we ask for help from hundreds, and "1" is gone. 10-2- 1=7, so it is equal to 77.

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