Try it yourself, before going any further. Add 7 9 by subtracting the complement of the larger digit from the smaller digit. The complement of The complement of 9 is - 7 - is -Remember to record a ten. So the answer is 16. I hope that is what you arrived at through the new method, even the first time. If not, then it hasn't become clear yet. Another reading of the article is indicated.
Now add 3 + 8. Would you subtract the complement of 8 from 3? What is the complement of 8? Don't forget to record a ten.
Strange and complex as this system undoubtedly seems at the moment, it is really far faster. This is because you are working with only the easier half of the forty-five digit combinations, the half that add up to less than ten.
Each time you use it, the system will become a little easier and more natural.
Add 6 + 5. The complement of 6 is - 5 minus - is - Record a ten.
As you incorporate this method into your life you will see what a difference it makes.