Mathematical calculation of carry: operation and analysis of vertical process 56+44 (the second correct point), aligning the digits of two addends, and then adding the numbers in the same counting unit respectively. When the addition result exceeds 10, 1 is added to a higher order, and the addition of a higher order needs to accumulate the result of 1 to a lower order.

6+4=0 to the high position becomes 1.

5+4+ 1=0 to the high position becomes 1.

According to the above calculation steps, the combined calculation result is 100.

Checking calculation: 100-56=44

In basic arithmetic,

Carry is a form of operation. In addition, when the number on each bit is equal to the radix, the previous bit goes into 1. It is part of the standard algorithm, starting with the rightmost number and then passing it to the left. For example, when the sum of 6 and 7 is equal to 13 in decimal, the right column writes "3" and the left column writes the resulting carry "1". When used for subtraction, this operation is called borrowing.