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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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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Posted on Jan 02, 2017

- Make sure you're working with two fractions.
- Multiply numerator x numerator, then multiply denominator x denominator.

- Make sure you're working with two fractions
- Flip the second fraction upside down.
- Change the division sign into a multiplication sign.
- Multiply top x top and bottom x bottom.

- Convert mixed numbers into improper fractions.
- Take the whole (non-fraction) number and multiply it by the denominator.
- Add that answer to the numerator.
- Put that amount over the original denominator and you will have an improper fraction.

- Find the lowest common denominator (bottom number). For both adding and subtracting fractions, you'll start with the same process.
- Multiply fractions to match the lowest common denominator.
- Add or subtract the two numerators (top number) but NOT the denominators.

Mar 07, 2017 | Homework

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

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

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

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

Moisture damage if exposed to humidity

Jul 24, 2014 | Canon MP11DX Desktop Calculator, 12-Digit...

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.

batteries are fresh, you can try manually resetting it by following steps:

1. Remove all of the

2. Press and hold the

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

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

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 .

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

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

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.

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

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(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.

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

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

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

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

28 / 2 - 12 x 3 =

14 - 36 =

-22

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

Oct 26, 2017 | HP 48gx Calculator

Dec 18, 2017 | HP 48gx Calculator

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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.

Same problem here. Looking for a solution.

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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