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Loggik


Newbie


Joined: 19 Feb 2011
Posts: 5

Posted: 19 Feb 2011 04:13:23 pm    Post subject:

I used to have the TI-84+ Silver Edition, and I loved it. I'm currently in Geometry L1 (yeah... I know even a TI-84 is overkill, but read on and you'll think I'm insane Wink). I SOMEHOW! lost my calculator. So I went to Staples and compared the TI-84+ SE to the TI-89 Titanium, and ultimately liked the TI-89 better. I've seen many people saying how much harder it is to use the TI-89 once you're used to the TI-84, but TBH, it's not that difficult at all, and even though I've only had it for maybe 20 minutes, there are 20+ built in features that I would have killed for on the TI-84 (factor/solve feature <3).

Anyway... the ONLY issue I have is this: If I type in 1/25, it outputs 1/25. It's kind of annoying...
Same with pi. If I input 4(pi), it outputs 4(pi), but I obviously wanted it to multiply pi by 4 and output the result... I couldn't find any options in Mode that would change this. Any ideas?

Thanks!

Also, I noticed that my TI-84 only had FIX n, where the TI-89 has FIX n and FLOAT n. I'm assuming that FLOAT n will round at the nth place after the decimal, but not show unnecessary decimal places?


Last edited by Guest on 19 Feb 2011 04:16:10 pm; edited 1 time in total
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Loggik


Newbie


Joined: 19 Feb 2011
Posts: 5

Posted: 19 Feb 2011 04:34:30 pm    Post subject:

Nevermind... I found that Exact/Approximate is the setting that I'm looking for. The only problem though is that the Auto isn't really automatic... it always uses Exact. So this means that I'm going to manually have to switch in between exact and approx? That's somewhat frustrating...

Edit: Surprised I found out how to do it without constantly changing the mode! Just press (Diamond Key Thing) and Enter (the approx sign). This is really exciting to me Razz


Last edited by Guest on 19 Feb 2011 04:41:24 pm; edited 1 time in total
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Xeda112358


Active Member


Joined: 19 May 2009
Posts: 520

Posted: 19 Feb 2011 06:21:13 pm    Post subject:

Ah, you will come to appreciate the use of not approximating to a decimal... sometimes it is nice to put in sin(pi/4) and have it return √(2)/2 instead of the decimal. As another trick, if you include a decimal in the calculation, it automatically outputs a decimal (unless you are in Exact mode). So if you did 4.*pi it would return the decimal.
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Loggik


Newbie


Joined: 19 Feb 2011
Posts: 5

Posted: 19 Feb 2011 09:06:39 pm    Post subject:

ThunderBolt wrote:

Ah, you will come to appreciate the use of not approximating to a decimal... sometimes it is nice to put in sin(pi/4) and have it return √(2)/2 instead of the decimal. As another trick, if you include a decimal in the calculation, it automatically outputs a decimal (unless you are in Exact mode). So if you did 4.*pi it would return the decimal.

Yes, I have gotten to appreciate (sort of forced to use) fractions over decimals. That's because if you answered a question on a homework or anything with a decimal (even if it was just 1/2 simplified to .5), my algebra 1 teacher would mark the answer wrong.
And now, this year, some of the questions tell you to leave your answer in terms of pi, or it could be useful when simplifying radicals (which I love how this calculator can do so easily!). So yes, I do enjoy having it output the exact result. But sometimes when the questions say to round to the nearest tenth, the Diamond+Enter option is nice (:
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