This explanation was reported on 9 News as a rationale for Common Core math. You be the judge. After partnering, decomposing, and, anchoring do you feel a greater sense of comfort? This method does not eliminate the need for memorization. In this instance the student needs to have memorized 9+1=10 as well as 1+5=6, but this is somehow more comfortable because the first two memorizations help you convert the difficult 9 to the more friendly 10. Watch video below for full explanation.