Question about HP Office Equipment & Supplies

# HP 28C Scientific Calculator

I have the above calculator and would like to use it, but I don't have the manual and don't know what type of batteries to buy. Could you tell me the type and voltage? I know there are three of them.

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• mofrid Dec 09, 2008

My error, it should be HP 28S for scientific!!

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• HP Master

It takes three N cells, 1.5 volts each.

Posted on May 31, 2014

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
Good luck!

Posted on Jan 02, 2017

change the mode to stat and then start operating it in statistical mode

Posted on Feb 26, 2008

There are plenty of casio 991 manuals here. Take your pick!
http://safemanuals.com/zearch_160.php

Dom't forget to leave feedback if it solves your problem. 'fixya'!

Posted on May 01, 2008

Do whatever the number is then ^(1/4)

Posted on Jun 02, 2009

Hello,

1. To convert a number to scientific equation, use [2nd][Sci]
Exemples 12345 [=] screen shows 12345 Then [2nd][Sci] coverts it to 1.2345 ^04 to the power 4.
2. To enter directly a number in scientific notation (e.g. -1.2345 X10^(-65) a very small number) you use the [EE] key 1.2345[+ /-][EE][+/-]65 shows as -1.2345 -65
1.6X10^(-19) 1.6[EE][+/-]19 shows as 1.6 -19

Hope it helps

Posted on Sep 17, 2009

Hi,
Sorry to disappoint you: This calculator is not programmable.

Good luck.

Posted on Nov 30, 2009

Testimonial: "Very much appreciated, quick response etc. "

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## Related Questions:

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The HP 32SII calculator has a very common problem with the keyboard connections. There might be nothing else wrong with the calculator except the contacts.

Try pinching the calculator just below the middle of the screen above the [LN] and [Y^x] keys while pushing the [C] button to power it on.

If this worked, at least you know where the problem is. Fixing that problem temporarily, some users wrap a rubber band around the calculator at that point and put something under it to keep pressure on that spot.

The longer-term fix is harder and involves taking the calculator apart to replace a foam pad to keep pressure on the plastic keyboard contact strip against the printed circuit board contacts.

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### I have an HP 12C calculator and I cannot find the user manual and I cannot remember how to change the no. of decimal places?

Check this HP FAQ:
Setting a Fixed Decimal Place You can download the manual and user guides for your calculator from here:
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=81575&lang=en&

http://h10025.www1.hp.com/ewfrf/wc/product?lc=en&dlc=en&cc=us&lang=en&product=81575&

Introduction This document describes how to set the desired number of decimal places on the HP 12c calculator in standard format. It also covers how to enter a number in scientific notation. Instructions for standard format
1. Press and release .
2. Press the number key for the desired number of decimal places to be displayed to the right of the decimal point (0 through 9). The calculator displays a maximum of 10 digits.
The display will show the specified number of decimal places. The answer will be rounded to the number of digits selected. Example (standard format) If the number in the display is 14.87456320, the display will be changed as follows: Keystroke Display 14.8746 14.9 15 14.87456320 Instructions for scientific notation Use scientific notation for very large or very small numbers. Type in the mantissa. After pressing, the next numbers keyed in are exponents of 10. Press . If during an operation a result has more than 10 digits, the calculator automatically displays the number in scientific notation

Introduction This document describes how to set the desired number of decimal places on the HP 12c calculator in standard format. It also covers how to enter a number in scientific notation. Instructions for standard format
1. Press and release .
2. Press the number key for the desired number of decimal places to be displayed to the right of the decimal point (0 through 9). The calculator displays a maximum of 10 digits.
The display will show the specified number of decimal places. The answer will be rounded to the number of digits selected. Example (standard format) If the number in the display is 14.87456320, the display will be changed as follows: Keystroke Display 14.8746 14.9 15 14.87456320 Instructions for scientific notation Use scientific notation for very large or very small numbers. Type in the mantissa. After pressing, the next numbers keyed in are exponents of 10. Press . If during an operation a result has more than 10 digits, the calculator automatically displays the number in scientific notation

Aug 24, 2009 | HP 12c Calculator

### User manual for the scientific calculator HP 8s

Hello,
I can't locate any information regarding an HP 8s Scientific Calculator, but I can locate information on a HP 9s Scientific Calculator. Perhaps they are similar in function. From the HP web site, please check out the link below.

I hope this helps!
- CBR2009

http://h10032.www1.hp.com/ctg/Manual/bpia5267.pdf

Oct 10, 2008 | HP 8S Scientific Calculator

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