G'w'uh? I'm confused. Perplexed. Puzzled even. I just started grading my first set of papers and one of my students presents the most amazing conundrum. He sets up the problem correctly. Simplifies it and isolates the variable correctly. Reduces it to the point where all that is required is simple division which is easily accomplished either by hand or with a calculator, and then gets the wrong answer. An example. The last line of one of his problems reads: 120/600 = 72000. There was a decimal point in there somewhere, but the marks he made in attempting to convert it to a percentage make it impossible to tell where the decimal point originally was. Notwithstanding, that's nowhere near the correct answer of .2 no matter where you place the decimal point. Most of you have probably noticed by now that if you divide 120 by 600 you get the correct answer, but he apparently decided on some other operation which I still can't fath... oh dear God. He added them together. I'm no longer puzzled, but I kind of wish I were. I think this boy may need to review basic arithmetic. Edit: No, I'm still puzzled. Not all of them were added together and I can't figure out what he did to some of them.