as smart as a 5th grader

source:
Competition Math: for Middle School (Volume 1)
p. 48

More evidence that "repeating the same lesson over and over" works as well as Howard Gardner's Chinese teachers said it does. I knew how to solve this problem within a few seconds of looking at it, and the reason I knew how to solve this problem within a few seconds of looking at it is that I used the difference of two squares to rationalize denominators many, many times while working my way through Saxon Math.