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.

32+ 13 problem solving process:

Step 1: 2+3=5

Step 2: 3+ 1=4

According to the above calculation steps, the comprehensive calculation result is 45.

45-22 Problem solving process:

Step 1: 5-2=3

Step 2: 4-2=2

According to the above calculation steps, the comprehensive calculation result is 23.

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