The abdication point is calculated in the subtraction vertical operation of your mathematics. For example, both the minuend and the minuend are four digits, and the units, tens, hundreds and thousands of the minuend and the minuend should be aligned in the vertical operation. First, subtract single digits. For example, if the single digit of the minuend is less than the single digit of the minuend, a dot should be added to the ten digit of the minuend. This point is the abdication point, that is to say, 1 10 is borrowed from ten digits, and the difference of digits is calculated by adding 10 to the original single digit and subtracting the number on the minuend. For example, decimal, percentile, decimal and percentile less than the minuend are calculated in the same way.

It should be noted that if 1 is borrowed from the decimal digit, 1 should be subtracted from the reduced decimal digit when calculating the decimal digit, as should the reduced hundredths and thousands.