We have been working on "mastering" addition facts. (Ben was doing well in math in school -- but he was still using his fingers for almost all addition and subtraction.) This week we have been working on +2. At the end of the week Ben breezed through his worksheet. When I asked him a couple of facts orally he stumbled. I took out the chart and a sticker and I asked, "What do you think. Have you mastered these facts or do we need one more week?" He looked at me thoughtfully... and said "I think I need one more week."
Wow! It takes a lot of maturity to resist putting the sticker on the sheet and recognize that more practice is needed!