Originally Posted by puffin
Originally Posted by yykrissykk
maybe they're doing this?
http://www.cut-the-knot.org/arithmetic/rapid/Specifics/Times9.shtml

That is how i would have done it.

Not that I can tell, that's the only problem out of 20 that had 9s in it. The rest of them were just random numbers and dd was solving them the traditional way and those weren't marked wrong. This was the only problem where things weren't stacked neatly on top of each other and had a question asking what it was next to it.