Questions regarding calculators being used to solve math problems. A clear statement of the math problem to be solved is required.
Questions tagged [calculator]
436 questions
16
votes
3 answers
Why would a calculator have base 5?
I have a calculator that I found recently that has a base 5 option. It has options labelled HEX, BIN, DEC, OCT, and PEN. My son set it on PEN, and no numbers above 4 worked anymore. Playing around with it, it was clearly base 5. (E.g. 22 divided by…
Brian Rushton
- 13,255
- 11
- 59
- 93
4
votes
1 answer
Can anyone figure out the functioning of this Ukranian 1917 pinwheel calculator?
I have bought this online, but cannot for the life of me figure out what it does.
It says "composition" at the top and "reading" at the bottom.
There are columns of numbers with a sliding ruler next to each one, marked with red dots. The pen is used…
4
votes
6 answers
Calculate remainder on Casio fx-991 ES Calculator
Is it possible or not to calculate remainder through use of Casio fx-991 ES Calculator. If possible then how
for example :- I have to calculate remainder of 2345763534 rem 24 and other media except calculator is forbidden. If this isn't possible…
nKandel
- 153
4
votes
3 answers
Wrong calculation by a calculator
Today I was working on some chemistry problems . Many of you might know it involves some big exponents. So today I just entered in one of my calculators (which might not be strong) as it was inbuilt in my mobile $ 13\cdot 10^{11}$(before entering my…
Archis Welankar
- 15,910
4
votes
3 answers
Trigonometric functions as fractions on TI-84 Plus.
I know that on the TI-84, you can use mode to change settings to fraction mode. However, when I used trigonometric functions to convert them into fractions, they gave me decimals still. Is there another step you have to take in order to receive…
RK01
- 803
4
votes
3 answers
How do you plot $x = y^2 - 6$ on a graphing calculator?
I have a graphing calculator app (Graphing Calculator+) that only allows me to enter $x$ as a variable, but I need to graph $x = y^2 - 6$.
I haven't used a graphing calculator in awhile. Is this normal? If it is, is there some kind of a trick to…
subtlearray
- 285
4
votes
2 answers
How to find high power numbers modulo
How can I find high power number modulo number. What If I have to do it with the calculator or if the calculator is not allowed in exam.
For example:
$174^{55} \pmod {221} \equiv 47$
mubeen
- 143
3
votes
1 answer
Calculating the percentage of the difference between two values
If I have the following two different values for x:
x = 0.022
x = 0.020
And, if I want to calculate the percentage of the difference (change) in x, will it be?
---> 0.022 - 0.020 = 0.002
---> 0.002 x 100% = 0.2%?
And, should the percentage of the…
Simplicity
- 323
3
votes
2 answers
Why doesn't my TI-84 give me an exact value when calculating scientific notations?
I was doing a statistics probability problem and I needed to find the value of (0.17)^4. When I entered the value into my calculator, I noticed that it gave me the answer in scientific notation (8.3521E-4). I figured let me try entering 8.3521 *…
Joy Nath
- 31
3
votes
2 answers
is there a CIS button on graphic calculators (Casio/TI)
Is there a cis (CosX + iSinX) Button in CASIO graphic calculators ? if so where its ?
if no is there any turn around for it ?
PS. I got a CASIO fx-9860G
Thanks
omeid
- 133
3
votes
1 answer
Getting the Total value from the Nett
I can't figure out this formula; I need some help to write it out for a php script.
I have a value of $\$80$.
$\$80$ is the profit from a total sale of $\$100$; $ 20\%$ is the percentage margin for the respective product.
Now I just have the $\$80$…
sammry
- 133
3
votes
3 answers
Is $\tan^{-1}$ for $\arctan$ on my calculator wrong?
On my calculator $\tan^{-1}$ is used to calculate the $\arctan$, but $\tan^{-1}$ actually is $\cot$. $\cot$ and $\arctan$ are not the same thing though. Am I missing something or is the labeling of my Casio fx-991ES really wrong?
To make the…
Stacksatty
- 41
2
votes
2 answers
In my calculator why does $\sqrt4 -2=-8.1648465955514287168521180122928e-39?$
I have tried this on my Windows 7 calculator with $\sqrt9 -3 $ it too gives some weird answer- ie$1.1546388020691628168216106791278e-37$. And so for any $n$(positive) $\sqrt n^2-n= wierd_ .answer$
Why does this happen?
Shivam Patel
- 4,012
2
votes
1 answer
Why does my TI-84 evaluate this expression involving pi to a whole number?
While working on some homework tonight, I entered the following expression into my TI-84 Plus:
$$\frac{(90×0.006)}{(\pi/4×0.006^4)}$$
I did a double-take when I saw that the output was exactly 530,516,477. I was under the assumption that any…
leavesy
- 23
2
votes
1 answer
Calculator - Why can I not calculate 7F FF FF FE * 2
I just tried to calculate on my CASIO fx-991 ES the following equation:
$7F FF FF FE_{16} \cdot 2$ and
$7F FF FF FE_{16} + 7F FF FF FE_{16}$
My result was MATH ERROR.
I therefore expected I overshot the 32 bit limit of the base mode of my…
TheCommoner282
- 133