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Best Buy via Google Express has **Texas Instruments TI-Nspire CX II Graphing Calculator** on sale for **$110.49** when you apply promo code **SEPTSAVE19**. S**hipping is free**. Thanks daisybeetle

**Note**, sale price is valid only for **New Google Express Members**, otherwise is $130.99

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Written by
Edited September 6, 2019
at 07:21 PM

As a parent I had the pleasure of having to order one of these this year.

Best Buy via Google Express

Texas Instruments TI-Nspire CX II Graphing Calculator [google.com] $130.49 - $20 w/ New Customer code SEPTSAVE19 = $110.49. Shipping is free.

Best Buy via Google Express

Texas Instruments TI-Nspire CX II Graphing Calculator [google.com] $130.49 - $20 w/ New Customer code SEPTSAVE19 = $110.49. Shipping is free.

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## 110 Comments

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This comment has been rated as unhelpful by Slickdeals usersYour specific example about differential equations, I would assume most professors prefer you know how they work rather than plugging an equation into a calculator. It doesn't take a genius, it's literally what you're meant to learn in the courses. Especially on exams where time is essential, it actually saves a lot of time to know how to solve by hand rather than inputting a complex equation, and often times professors make a question that can't be solved by inputting numbers into a calc (ie. If a question says "Show")

99% of the time, the most advanced function you will need on a calculator is storing numbers into a variable, which you can do on non/graphing calcs (like the TI-30XS I mentioned).

This comment has been rated as unhelpful by Slickdeals usersThis comment has been rated as unhelpful by Slickdeals usersYour specific example about differential equations, I would assume most professors prefer you know how they work rather than plugging an equation into a calculator. It doesn't take a genius, it's literally what you're meant to learn in the courses. Especially on exams where time is essential, it actually saves a lot of time to know how to solve by hand rather than inputting a complex equation, and often times professors make a question that can't be solved by inputting numbers into a calc (ie. If a question says "Show")

99% of the time, the most advanced function you will need on a calculator is storing numbers into a variable, which you can do on non/graphing calcs (like the TI-30XS I mentioned).

Like you said, it is mostly used for arithmetic. Bun when you are knee deep in showing your work, you want to be able to scroll up and see where things went wrong if they did.

This comment has been rated as unhelpful by Slickdeals usersAnd the poster you reponded to is correct, you don't need a graphing calculator for the majority of college math courses.

In the rare case, you might use graphing to find an asymptote or decide on a solve strategy, but this is rare and only in very specific courses.

That said, speaking as an "uneducated math teacher" (I was a high school math teacher who also happens to have multiple "math/stats" degrees including one in education) there are a variety of reasons to suggest students have an easy to manipulate graphing calculator, but lots of them wouldn't necessarily resonate with the types of people who end up with higher level math degrees. For lots of reasons (including prior math experience) for many students, being able to quickly and accurately graph a variety of equations (and be able to distinguish between them) can do wonders for conceptual understanding in classes like Algebra 1. A skilled math teacher is not the same as the person with the most degrees or the best GPA in college math, which barely aligns to what's taught in high school. Rather, the skill comes in being able to explain / teach to students who will not eventually be getting those higher level degrees. And while smartphones/tablets have lots of great apps, it's worth analogizing to trying to do word processing on an iPad - sure, it works, but it's a lot harder than using a "real" laptop (at least for many folks), and having a standard set/model for the class means less barriers to learning.

This is all just to say that for parents that are on the fence about dropping the $$$ on one of these calculators, chat with your students' math teacher, see what their plans are, ask if they provide specific instructions (in class) for just *this* (or any specific) calculator, as opposed to more general instructions (i.e. "graph this line). If you've got a kid who's into figuring stuff out on their own, then they'll likely be able to figure out how to make a cheaper (i.e Casio or older used model via CL/eBay) model work for them for most of what happens in a high school class. Could your child get by with just a four-function calculator that you could get at the dollar store? Probably, but assuming the calculator will necessarily be more helpful if your child is planning on being a college math major is a mistake.

[And all THAT said...these are WAY too expensive for what they are (blame College Board and ETS for virtually mandating these for AP/SAT etc); the TI-89 I bought in 2000ish still has far more than I'd ever need to teach high school students (and in some ways has some functionality I'd like to disable!). I think schools should be funded to the point where some version of a graphing calculator can be provided to students, free of charge, as they walk in the door...but that's a conversation for another time...]

This comment has been rated as unhelpful by Slickdeals usersLike you said, it is mostly used for arithmetic. Bun when you are knee deep in showing your work, you want to be able to scroll up and see where things went wrong if they did.

This comment has been rated as unhelpful by Slickdeals usersgraphing calculators make you bad at math while your in school. if you can't understand what the calculator is doing, you're not learning. it's disgusting these days that they give and make students use calculators as early as 5th grade... at that level, there's no need for them to ever have one and all it does it make the kids not learn the basics at a young age. they're really doing kids a disservice these days.

This comment has been rated as unhelpful by Slickdeals usersYour specific example about differential equations, I would assume most professors prefer you know how they work rather than plugging an equation into a calculator. It doesn't take a genius, it's literally what you're meant to learn in the courses. Especially on exams where time is essential, it actually saves a lot of time to know how to solve by hand rather than inputting a complex equation, and often times professors make a question that can't be solved by inputting numbers into a calc (ie. If a question says "Show")

99% of the time, the most advanced function you will need on a calculator is storing numbers into a variable, which you can do on non/graphing calcs (like the TI-30XS I mentioned).

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This comment has been rated as unhelpful by Slickdeals usersThis comment has been rated as unhelpful by Slickdeals usersThis comment has been rated as unhelpful by Slickdeals usersgraphing calculators make you bad at math while your in school. if you can't understand what the calculator is doing, you're not learning. it's disgusting these days that they give and make students use calculators as early as 5th grade... at that level, there's no need for them to ever have one and all it does it make the kids not learn the basics at a young age. they're really doing kids a disservice these days.

Okay, BUT, I have listened to arguments about how the internet and advanced tools now negate the need for everyone to have a solid foundation, because these tools are now universally available for anyone to use at anytime. There will always be a select few people to build and maintain these advanced tools for all to use. It allows a larger number of people to use (but not understand) advanced mathematics in their careers.

I understand both arguments, and I would surmise there isn't one way, and both can be applied in careers. Personally, as a society, I think it would be far more beneficial that a large majority of the people understand how to use the tools that are available versus spending copious amounts of time and resources teaching everyone a strong foundation, especially when only a small percentage will apply that knowledge to their careers. For me, it all comes down to the ROI of a student's time. In AP and Honors math, teach a strong foundation to those who will use it. In mainstream math, teach those kids how to use the tools available to them. I see value in both... Education is not a one size fits all proposition.

This comment has been rated as unhelpful by Slickdeals usersIs this the page? - https://education.ti.co

Is it "TI-89 Titanium Operating System"? I see that but it is not an instant download there is a form field to fill out then you must wait for it to be approved by TI after saying you own the product and describing why you need the download.

This comment has been rated as unhelpful by Slickdeals usersIs this the page? - https://education.ti.co

Is it "TI-89 Titanium Operating System"? I see that but it is not an instant download there is a form field to fill out then you must wait for it to be approved by TI after saying you own the product and describing why you need the download.

Which is just to say it's available, but not allowed...

This comment has been rated as unhelpful by Slickdeals usersIs this the page? - https://education.ti.co

Is it "TI-89 Titanium Operating System"? I see that but it is not an instant download there is a form field to fill out then you must wait for it to be approved by TI after saying you own the product and describing why you need the download.

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This comment has been rated as unhelpful by Slickdeals users