Solution: Align the two addend units, and then add the numbers in the same counting unit respectively. If the addition result exceeds 10, the high bit of 1 will be removed, and the addition of the high bit needs to accumulate the low bit of 1.

Problem solving process:

Step 1: 6+4=0 to the high position, 1.

Step 2: 5+4+ 1=0, and move to the high position of 1

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

Checking calculation: 100-56=44

Extended data ← Check the calculation result: align the unit of subtraction with the unit of subtraction, and then subtract them from the corresponding counting units. If the reduction is not enough, you need to borrow 1 from the high position, and then calculate the results in turn. If the subtraction is less than the minuend, the two numbers are exchanged and subtracted, and a negative sign is added to the final result; Fractional subtraction can refer to the integer subtraction step;

Problem solving process:

Step 1: 10-6=4 Borrow from high position 1.

Step 2: High-level borrowing 10-5- 1=4.

Step 3: 1-0- 1=0.

According to the above calculation steps, the comprehensive calculation result is 44.

If in doubt, please ask questions. If satisfied, please adopt them.