First stab at actually teaching

(Originally written March 2012)

Still doing the math intervention twice a week.  There are always some stragglers who don't show up on Monday, so this week she had me teach them on Tuesday to try to get caught up.  This worked out well--since I'd sat through the class on Monday I knew what to teach and how to teach it.  Experienced teachers can sometimes "wing it" through new material, leveraging their overall knowledge of teaching techniques to come up with something decent with no real preparation.  I don't have that, but I am able to do the opposite--if I have something like a script to follow I can follow it, and that's pretty much what I did.

We are covering percentages.  The basic idea is that every percentage computation is of this form:

percentage/100 = portion/total

This breaks down into two broad categories:  overall proportion, and change proportion.  The overall proportion is easier, you tell the students to set this up first thing, and look for the "is number", the "of number", and the "percent number".  So, they normally write something like this:

x %                   15      is
-----------  =   ---
100                   60      of

It really helps to have them write out the "%", "is", and "of", which helps them keep track of what they are doing, retracing their steps if necessary.

Normally a word problem will give you two out of the three:  you set a variable for the third value, do a cross multiplication, then divide out to make the "letter a loner".  They can learn to do this mechanically with repeated drills, you need to keep after them to write out their steps.  If a student doesn't understand something about a math problem, 90+% of the time they can figure out what went wrong if they simply write out all the intermediate steps.

The change proportion ones are trickier to do, and much trickier to teach.  The first step is normally to write out the problem template similarly:

percent      change
-------- =  -------------
100            original amount

But there are usually two major steps you have to do:  compute the change amount, and compute the change percentage.  Sometimes you have to do one first, sometimes the other first.  I didn't state that explicitly, perhaps I should have.

One thing I do do that the other teachers don't, as much, is the Socratic method:  when introducing a new concept, I ask a question and then pick out a student to answer it.  This helps keep them subject-focused.

One problem I'm having, though, is keeping *myself* subject-focused when the teacher is teaching!  I spend a lot of time making mental notes of her teaching techniques and the reactions of students, to the point where I lose the thread of the subject at hand.  This will be a particular challenge in math, since the mindset of teaching and the mindset of math are so different.  I kind of got caught when my pants down when she called me up to the board to work through the problem, since I had been watching how she and the students said and did things, to the point of excluding what they were actually saying.