Question about HP 48gx Calculator

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Non functional keys

The entire far-right column of keys does not function. Pressing any of these keys (NXT, right-arrow, 1/x, delete, divide, multiply, subtract, add) just does nothing. I don't recall doing anything to the calculator (no drops, spills, etc.).

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  • Anonymous Dec 03, 2007

    I have the same problem, but with only 3 keys (1/x, y^x, sqrt). I've found in other forums that this is a common problem for this model as it gets older. I found one set of instructions to take the calculator apart and clean the contacts, but the instructions are not clear and it sounds like it's easy to cause alot more damage.

  • dhayes255 Jan 07, 2009

    Same problem here. Looking for a solution.

  • wal_y_fipe Feb 09, 2009

    I have the same problem, even after doing the soft reset and the keyboard testing. However, mine is for a whole line from top to bottom.

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HP 48SX and HP 48GX calculators have a membrane which connects between the internal circuit boards. This is a common failure point. The "ON" button is often the first button to go out. The calculator can be opened up can cleaned, but it is a little involved. Forutnately someone has posted pictures and information on what to do.

http://www.hpcalc.org/hp48/docs/opening/hprepair.zip

There is a text file with information. The file is big because of the pictures. Summary: Open the case, bend metal clips holding the circuit boards together. Clean up any dust and the contacts. Reassemble.


Posted on Mar 02, 2009

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Don't use those keys

Posted on Apr 06, 2008

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6ya6ya
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Posted on Jan 02, 2017

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1 Answer

How to solve franctions


Multiplying Fractions:
  1. Make sure you're working with two fractions.
  2. Multiply numerator x numerator, then multiply denominator x denominator.
Dividing Fractions:
  1. Make sure you're working with two fractions
  2. Flip the second fraction upside down.
  3. Change the division sign into a multiplication sign.
  4. Multiply top x top and bottom x bottom.
Converting Mixed Numbers into Improper Fractions:
  1. Convert mixed numbers into improper fractions.
  2. Take the whole (non-fraction) number and multiply it by the denominator.
  3. Add that answer to the numerator.
  4. Put that amount over the original denominator and you will have an improper fraction.
Method for Adding and Subtracting Fractions:
  1. Find the lowest common denominator (bottom number). For both adding and subtracting fractions, you'll start with the same process.
  2. Multiply fractions to match the lowest common denominator.
  3. Add or subtract the two numerators (top number) but NOT the denominators.

Mar 07, 2017 | Homework

1 Answer

What are 4 different fractions that are equal to 1 1/2


Hi Anonymous,
You can make equivalent fractions by multiplying or dividing both top and bottom by the same amount, but only multiply or divide, never add or subtract, to get an equivalent fraction.
I've only shown the fraction part of your question as 1 is a whole number.
1/2 = 2/4, or 4/8, or 8/16 or 16/32 or 32/64 & so on.
Going the other way, dividing 2/4 by 2 will give 1/2.
But, only divide when the top and bottom would still be whole numbers, for instance you wouldn't use divide for odd number fractions, for example 1/3 or 3/5 etc.
Trust this helps, best regards Alan

Feb 11, 2015 | Office Equipment & Supplies

1 Answer

What is 67,872 divided by 24, step by step?


First, find out how many whole times 24 will go into 67
67/24 = 2 with a remainder that we don't care about. Write down 2
Next, multiply that answer (2) by 24 2 X 24=48
Subtract that 48 from 67 67-48=19
bring down next digit (8) append to the19 198
divide 24 into 198 198/24=8 Write down 8
multiply that answer by 24 8 X 24 =192
Subtract that 192 from 198 198 - 192 = 6
bring down next digit (7) append to the 6 67
divide 24 into 67 67/24 =2 Write down 2
multiply that answer by 24 2 X 24 = 48
subtract 48 from 67 27-24=19
bring down next digit (2)append to the 19 192
divide 24 into 192 192/24 = 8 Write down 8
multiply that answer by 24 24 X 8=192
subtract 192 from 192 192-192=0 You're done!
Your answer is the numbers you wrote down after the divisions = 2848

2 8 4 8
----------------------
24 ) 67872
- 48
198
-192
67
- 48
192
- 192
0

Oct 15, 2014 | Office Equipment & Supplies

1 Answer

Can not reset calculator. Keep getting + sign when press enter


If the TI-84 does not function even though you are sure that the
batteries are fresh, you can try manually resetting it by following steps:

1. Remove all of the AAA batteries from the graphing handheld

2. Press and hold the ON key for ten seconds

3. Replace the batteries

4. Turn on the unit

When you reset your graphing handheld, the contrast sometimes
changes. If the screen is faded or blank, adjust the contrast by
pressing 2nd and releasing up-arrow or down-arrow keys.

Feb 24, 2013 | Texas Instruments TI-84 Plus Calculator

2 Answers

Why can't I multiply negative numbers on my El-520x???


Make sure you use the +/- key (located just to the right of the decimal point key) to enter a negative number, not the - key (to the right of the + key, used to subtract one value from another).

For example, press +/- 4 / +/- 3 = to divide -4 by -3 .

Jan 19, 2013 | Sharp EL-520XBWH Scientific Calculator -...

1 Answer

We are trying to add, subtract, multiply, and divide matrixes, but the Casio calculator that we have will allow for us to input the information into the calc. However, it will not allow for us to add,...


This post is rather exhaustive as regards the matrix capabilities of the calculator. So if the post recalls things you already know, please skip them. Matrix multiplication is at the end. As to division of matrices, I do not believe that this operation exits.

Let me explain how to create matrices. (If you know how to do it, skip to the operations on matrices, at the end.)

First you must set Matrix calculation
[MODE][6:Matrix]. Then By entering one of the numbers [1:MatA] or [2:Matb] or [3:MatC] you get to choose the dimensions of the matrix
(mxn]. Once finished entering the matrix you clear the screen.

The operations on matrices are available by pressing [Shift][Matrix]
[1:Dim] to change the dimension of a matrix (in fact redefining the matrix)
[2: D A T A] enter values in a matrix
[3:MatA] access Matrix A
[4:Matb] access Matrix B
[5:MatC] access matrix C
[6:MatAns] access the Answer Matrix (the last matrix calculated)
[7:det] Calculate the determinant of a matrix already defined
[8:Trn] The transpose of a matrix already defined

To add matrices MatA+MatB (MUST have identical dimensions same m and same n, m and n do not have to be the same)
To subtract MatA-MatB. (MUST have identical dimensions, see above)
To multiply MatAxMatB (See below for conditions on dimensions)
To raise a matrix to a power 2 [x2], cube [x3]
To obtain inverse of a SQUARE MatA already defined MatA[x^-1]. The key [x^-1] is the x to the power -1 key. If the determinant of a matrix is zero, the matrix is singular and its inverse does not exit.

Dimensions of matrices involved in operations must match. Here is a short summary

The multiplication of structured mathematical entities (vectors, complex numbers, matrices, etc.) is different from the multiplication of unstructured (scalar) mathematical entities (regular numbers). As you well know matrix multiplication is not commutative> This has to do with the dimensions.

An mXn matrix has m rows and n columns. To perform multiplication of an kXl matrix by an mXn matrix you multiply each element in one row of the first matrix by a specific element in a column of the second matrix. This imposes a condition, namely that the number of columns of the first matrix be equal to the number of rows of the second.
Thus, to be able to multiply a kXl matrix by am mXn matrix, the number of columns of the first (l) must be equal to the number of rows of the second (m).

So MatA(kXl) * MatB(mXn) is possible only if l=m
MatA(kX3) * Mat(3Xn) is possible and meaningful, but
Mat(kX3) * Mat(nX3) may not be possible.

To get back to your calculation, make sure that the number of columns of the first matrix is equal to the number of rows of the second. If this condition is not satisfied, the calculator returns a dimension error. The order of the matrices in the multiplication is, shall we say, vital.

May 10, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

How do i program my calculator to add, subtract, divide and multiply imaginary numbers and get the correct answer?


Press MODE to bring up the mode screen. Use the arrow keys to move down to the line beginning "Real". Highlight either "a+bi" or "re ^ theta i" depending on whether you want to work in rectangular or polar coordinates, then press ENTER to save the change. Press 2ND [QUIT] to exit the mode screen.

Feb 17, 2011 | Texas Instruments TI-83 Plus Calculator

1 Answer

6+22)/ 2-12 x 3


Just follow the order of operations. 1. Parenthesis 2. Exponents 3. Multiply and Divide in order from left to right, and 4. Add and subtract in order from left to right. I'm assuming you are missing the left parenthesis before the 6 (.

(6 + 22) / 2 -12 x 3 =
28 / 2 - 12 x 3 =
14 - 36 =
-22

Oct 28, 2009 | The Learning Company Achieve! Math &...

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