[Guntruck]

HP 48GX...

TI-89

 

[crono35]

i miss my HP 48... seems a lot slower than the TI89, but what can you expect from something many years older..

 

[ioscope]

Hands up! Who was dumb enough to try the link?

 

[dump]

i disagree. once you get into deep physics, calculus, differential equations, etc, its very handy to have a graphing calculator
Ti-86 = t3h 1337 (or was back in the day)

We werent' allowed to use calculators in our physics, diffeq, partial-diffeq and calc... graphing would only let you know what the limits/intersections are, but for the most part, you should already have an idea of what the graphs look like.

 

[dump]

i miss my HP 48... seems a lot slower than the TI89, but what can you expect from something many years older..

i had an HP48... seems so much nicer imo than any ti i ever used.

i rarely used it for graphing... too slow, but for other computations, it was awesome... & it was cool for inverting matricies & the like

but then there's always matlab & mathcad

 

[Toshi]

We werent' allowed to use calculators in our physics, diffeq, partial-diffeq and calc... graphing would only let you know what the limits/intersections are, but for the most part, you should already have an idea of what the graphs look like.

same here, no calculators for those classes, all by hand as it should be. and not being able to calculate percentages is akin to not being able to add imo.

 

[johnbryanpeters]

I always try to leave 20% for good service so I just figure 10% of the total and double it.

ie: $35.80 = $3.58 X 2 = 7.16

I may round to $7.00 in a case like this.

Yup!

 

[HTFR]

i disagree. once you get into deep physics, calculus, differential equations, etc, its very handy to have a graphing calculator
Ti-86 = t3h 1337 (or was back in the day)

thats a different poison alltogether

 

[WarEagle2K]

i miss my HP 48... seems a lot slower than the TI89, but what can you expect from something many years older..

Yep, I used my HP 48 in undergrad and now I am using it in grad school. I thought about the new hp 49, but everything is menu driven. I bought it in 1995, still kickin.

 

[MMike]

same here, no calculators for those classes, all by hand as it should be. and not being able to calculate percentages is akin to not being able to add imo.

Exactly. I do have an HP 28S though....

I'm good with precentage with 8's..... I do lots of drawing with fractionss of inches.... 1/8 = .125, 1/16 = .0625, 7/16 = .4375.....that sort of thing.

And I calculate tip the same was N8.... 10% then divide that in half and add the two together.

I usually do 20% though. I'm a swell guy........

 

[Pau11y]

x/y * 100

I have a question: for someone who can't figure out what percentage 3/4 or 5/10 is, what the hell is he going to do w/ the info you provided w/o a calculator? Speaking of which, mine is a TI-92 (or 93, forgot) Titanium w/ the 2mb cache. Damn thing even comes w/ software to hook up to your PC (haven't installed yet).
As for memorizing formulas, I'm super weak in that area. I usually remember how to get from point a to point b to come up w/ the formula, and then I have to double check w/ the units. That's the method I used for physics and some of the applied calc probs. And, if I were to use the above info, it's missing the equal sign and the result, and should be written like this:

P (%)
------- = ratio (something/something - ie 13/40 )
100

Changes to:

13
--- x 100 = P (Percentage) = 32.5%
40

Basically, you have something which in it's whole, can be divided into 40 parts, and you only have 13 parts of the whole. You need to know what percent (parts out of 100) your 13 equates to. If you put what I just said in terms of math symbols, you get:

13/40 = P/100

This can be rewritten as 13/40 x 100 = P (%)

OR, think like this: 40 x 2.5 = 100. Therefore, 13 x 2.5 = 32.5%
If the 40 was say...56, then to get that multiplier (the 2.5), you'd divide the 100 by 56, which is 1.78571 (you'll need a calculator for this), rounded to 1.79. Then your percentage is 13 x 1.79 = 23.27%
In terms of symbols:

13
--- x 100 = P (%)
40

is re-written as:

100
---- x 13 = P (%) , and
40


100
---- = 2.5. So:
40


2.5 x 13 = P (%) and is where you'd get 32.5%

 

[kinghami3]

Hands up! Who was dumb enough to try the link?

me

 

[-dustin]

66.6666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666666%, or 2/3, of these replies are sad.

still hate calculus, though.