It's a Wonder I Have Any Hair Left

I read through today's math assignment early so I'd know which concept was most likely to trip up my students. Then during our warm-up I did some examples of it on the board, I had them do examples of it on their paper and I walked around and monitored it. Then, we reviewed the whole idea again. And I gave them the assigned problems for today. But, NO, it was almost universal--when they got to #6--an example of the example--hands went up "I don't know what this means" "Help me with this" "How do you do this". So we went over it on the board again--I set up the pattern. I practically told them the answers!!! Tiny light bulbs began to turn on in their little heads. Okay, taking a deep breath...Ten minutes later two girls, finally arriving at #6 because they didn't pay attention to the fact that I only assigned the even numbers whine out in unison "We don't get number six! Help!"