Step 2: Since 0-8 is less than 0, borrow one bit from the minuend (that is, the "0" of ten digits) to become 10-8, and the result is 2, which is written vertically. As shown in the figure:
Step 3: Because the zero of ten digits is borrowed by single digits, it leaves-1. Since-1- 1 is less than 0, one bit (that is, "1" of the hundredth bit) is borrowed from the minuend to become 9- 1, and the result is 8, which is written vertically. As shown in the figure:
Step 4: Because the 1 of 100 is borrowed by one of 10, there is still 0 left. As shown in the figure:
Fifth: remove the highest order 0 and get the result. Namely: 100- 18=82. As shown in the figure: