Math: simplifying decimal radicals

Tutoring high school math, you see this a few times each semester.  The tutor shows an example. Suppose you get asked a question like the following: Example: Simplify √(0.225) Unless you have one of those new-style calculators, perhaps the WriteView …

Perl: sleep() and the bell

To the tutor’s mind, Perl code is so easy to write, with so many neat functions, it’s a great teaching language.  Today we’ll have some fun. I’ve heard that some people don’t like programming in Perl.  I just can’t see …

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Physics: the wavelength of “middle” F

Tutoring physics 11, this topic comes up most years.  The tutor introduces the formula that relates speed to wavelength and frequency. Most people know that what makes sounds different is that they have different frequencies.  Moreover, a high pitched sound …

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Perl programming: chop and chomp

Continuing with Perl programming, the tutor discusses a couple of simple yet important functions: chop and chomp. Back in my Nov 19 post, I mentioned the Perl function chop. In that case, chop was used to strip the newline off …

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Seasons: one Canadian’s definition of the first day of spring

The tutor has long been a student of the weather.  He shares his own definition and reflections about the coming of spring. People who read this blog commonly may realize that I live on Canada’s west coast, but haven’t always. …

Lifestyle: Reading tablets vs books

The tutor has mulled this issue for awhile.  Has the time come to discuss it? More and more I’m hearing about reading tablets – tablets that display a book a page at a time.  When you’ve finished that page, you …

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Statistics: how to enter a list, then find its mean, standard deviation, and median on the TI-83 Plus

Tutoring high school statistics, some of my students use the TI-83 Plus.  The tutor shows one way to find the mean, median, and standard deviation on it. Of course, to find the mean, median, or standard deviation of a list …

Math: fractions on the TI-83 Plus

The tutor first encountered the TI-83 Plus back in the 90s.  Tutoring math, some of my students are allowed to use it. The TI-83 Plus is, to my mind, more like a computer than a calculator.  Most of my students …

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Calculus: implicit differentiation

Tutoring calculus, this topic is of importance.  The tutor is happy to introduce implicit differentiation. Implicit differentiation might come up a few weeks into the semester.  It’s a nice technique that enables the student to take derivatives of functions not …

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