I just did a class with a group of 9 year olds and we were looking at "what time is it?"
I drew a clock up on the board showing 11 O'clock and the kids had to come up and write in numbers and words;
One kid did the 11:00 - easy enough, and then a brave soul tried to write it - he wrote it wrong, but then I couldn't figure out how to write it properly! haha! poor kid was confused and started crying because he really wanted the point for his group and all I could say was "no, that's wrong" and I couldn't show him the right way!!
And I'm an English Teacher, I had to spell check this blog to see how you did spell it. What the heck am I doing teaching!? lol.