Watch this video, take notes, redesin lesson plan, try it out in class tomorrow

In 7th grade math, half our grade was the daily quizzes which were supposed to drill in the ability to do chained calculations recited aloud rapid-fire by the teacher, but simply separated those who could keep up from those who couldn't. I aced all written tests, failed all the quizzes, and got a C.

On the math example in the video, it's easy to keep a running total, calculator-style, on the second run-through... but only if I ignore operator precedence. That seems to be the intent, but it feels wrong.