Normally, I talk about religious issues here. My role as a former math teacher is just screaming at me today, however. I was blessed to receive an HP 50g graphing calculator from my in-laws for Christmas. To my mind, it is the best calculator currently on the market! After having a little time to get to know it over the past two days, I’m am more convinced of that than ever.

So, what’s the rant about? The silly TI monopoly that exists in the public schools, and even in some colleges. Students are pushed to buy the “latest and greatest” TI calculator. When I was teaching, it was the TI-83 or TI-84. The funny thing is, all the students seemed to use them for was playing games and avoiding learning how to graph. The effect is that parents are paying over $100 for a calculator that will be confiscated as a gaming device (which it’s not that good at).

My frustration is two-fold. First, while TI does make nice calculators, there are equally effective teaching tools available for far, far less money. Casio has an excellent, easy-to-use, graphing calculator for only $50. Sure, the interface is different from those on the TI’s, but *as a calculator* it is every bit as effective and useful. Add the more limited programming abilities, and you have a calculator that is less likely to have video games loaded on it.

If you think that $50 is a lot of money, and I know many people do, there is another option. Go to Big Lots! They have a programmable, graphing calculator for $16! True, it has lower resolution than the Casio or TI calculators, but has a small manual and just works.

Financially, then, I view TI calculators as a burden on parents of students. Public schools push these very over-priced devices on students, with the threat of not helping a student with the calculator if it isn’t one of the proscribed devices.

Educationally, there is an even larger problem. No teacher seems to be able to give a coherent reason as to ** WHY** the students need these. The standard answer I received was “They need it for the ACT” or “They need it for the SAT” or something similar. It was the most amazing thing, however. When I went to the sites for those tests, they clearly stated that graphing calculators were generally

*allowed*, but not

*required*. Certain graphing calculators (the TI-92 being the only one I know of that meets their ban criteria) aren’t allowed, and none are required.

What happens, then, is that graphing calculators make certain topics easier to “teach”. Graphing is a great example of this. Which is harder, to teach a student how to correctly graph y=x^3, or teaching them how to enter it into the calculator and let the calculator do it? The answer is obvious. Graphing calculators can automate many processes. How many students don’t know the quadratic formula because their calculator could do it for them, or be programmed to do it for them?

Unfortunately, at colleges, graphing calculators are not greeted with the same, warm enthusiasm they are in high schools. A graphing calculator can store every physical constant and formula quite easily. The physics and chemistry teachers know this, and frequently ban them from tests. Why? Because it’s like carrying a cheat sheet in with you.

By contrast, the math departments will tend to snicker at you if you bring in a graphing calculator. Why? Because it won’t do you any good in most classes! Outside of algebra, calculus, and differential equations, classes tend to be 90% theory and 10% calculation, at best. Some have essentially no calculation at all, or so much that a computer and programming experience is required.

The impact of all this is that high schools teach students to rely on calculators that will be banned in college. Without their calculators, these same students suddenly find themselves crippled as the holes in their math education are exposed.

Do I enjoy my new fancy calculator? Absolutely. With that said, I have picked up a few graphing calculators over the years. Two came from my wife when we got married, one was a present,one was a cheap toy (the $16 Big Lots calculator), and one is the HP 48GX I’ve had for over a decade. I had a TI 81 when it came out. I used its graphing features about twice in calculus. I used my brain daily.

Make students learn the math. Only after that, should they be allowed to use the calculator.

January 7, 2010 at 3:47 pm |

What’s even worse is the crappy teachers at my high school require you to have a graphing calculator. Some of the problems you can’t even do without it! I’m one of the few who still factors quadratic problems anymore. Everyone just “plugs it into the quad program”.

March 2, 2010 at 8:34 am |

Everything above is quite true, from personal experience.

Up until the 5th grade and multiplication/division, I wasn’t allowed to touch a calculator. I was actually the top of my class in math and I got numerous awards for it. On the other hand, my English Speech Skills and History skills sucked.

In the 6th grade, I was given a simple calculator that could do a lot (it wasn’t graphing). That year, I began to rely on the calculator and I ended up with a really low grade on the math exam (like everyone else, the highest grade was a 45, I had a 41). It wasn’t hard, the fact is, I began to rely on the calculator.

By the 9th grade, I had a TI89 and I was told that I could use it on everything. Luckily, I did get some background on how to graph properly, etc but the lack of practice further hindered me.

Now that I’m in college, I averaged C on all of my Math courses that require any kind of computation and that is all because I didn’t take the time (when I knew I should have) to learn how to do the math without the calculator.

Luckily, I’m still fairly strong in computer oriented math and logic although you can’t really use a calculator for this kind of math.

I really wish that schools would remove calculators because I feel that they do more wrong than good in the classroom. College is about the time when I should have first been familiarized with using a calculator.

March 2, 2010 at 11:41 am |

I actually had one of the seniors I taught Pre-Calc to thank me about a year later for prying his fingers away from his calculator. He got to college and suddenly wasn’t allowed to use a graphing calculator. At some point I’m going to have to make a drill program (probably in Java) to help people with their arithmetic skills.