This is an addition technique in which one starts with the most right column, adds the two digits, puts a "1" below or above the digit on the left if the sum exceeds 10, and puts the remainder in the sum. Then, we do the same with the columns left to it, adding 1 to the sum if it is in that column. It's fairly obvious and it is a common technique that is taught in many elementary schools in the Netherlands.
In Dutch, we call this technique "cijferen", which translates to something close to "digiting". Does this technique have a name in English?