Last week, we were working on algebra in my class. One of the problems on the page was 7 + f. There was a value given at the end, but the boys in my class wanted to despute it. They said that 7 + f had to equal m, or 13. Their reasoning? F is the 6th letter of the alphabet, and 7 + 6 equals 13. The 13th letter of the alphabet is m. Thus 7 + f = m, or 7 + 6 = 13.
I love these brains!