Current location - Plastic Surgery and Aesthetics Network - Plastic surgery and medical aesthetics - Integer addition and subtraction law
Integer addition and subtraction law
Law of addition and subtraction:

Add and subtract in the same unit, the unit remains the same, and the number of units is added and subtracted.

integer

1. The same number is aligned;

2. Start counting from the low position;

3. If you add dozens, you will advance to one place; When the subtraction is not enough, you will retreat from the last one, and a few will be dozens.