For example:

5505- 18=(5400+ 105)- 18=5400+( 105- 18)=5400+(80+25- 18)

=5400+80+(25- 18)

=5400+80+7

=5487

Extended data:

Subtraction by abdication, a special mathematical term, can also be called subtraction by borrowing. That is, when two numbers are subtracted and the number of digits to be subtracted is not enough, borrowing the previous digit is equivalent to adding 10 to this digit, and then calculating.

How many digits does it represent?

Ten digits 1 stands for 10, which means 10 1.

Hundred digits 1 stands for 100, that is, 10 has ten digits, and the top ten digits of 9 10 1.

And so on.

Ten digits is 0. If you borrow 1 from a hundred digits, it is 10+00.

Subtraction is the inverse of addition. You can use difference addition and subtraction to check whether it is equal to the minuend. If yes, the calculation is correct; If not, the calculation of subtraction is wrong.

For example, 5505- 18=5487

By addition, 5487+ 18=5497+8=5505= minuend, so the subtraction calculation is correct.

If it is not equal to the minuend, it is necessary to check whether the subtraction calculation is a borrowing error.

Baidu encyclopedia-abdication subtraction