Question about Casio Office Equipment & Supplies

1 Answer

Battery for Casio D-20M

Can someone tell me how to change the battery on a Casio D-20M calculator please?

Posted by Paul Duggan on


1 Answer


  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Casio Master
  • 8,091 Answers

Turn calculator over. Look for some small screws. Loosen them, remove the cover. Notice how the two batteries look when they are in place (polarity) and replace them. Close the cover and tighten the screws again. You need two LR 44 batteries or equivalent.

Posted on Feb 01, 2014


3 Related Answers



1. Press [AC]
2. Hold [SET/%] key for about 2 seconds
3. Press [TAX+]
4. Input the tax rate
5. Press [SET/%]

Posted on Jan 26, 2008



  • 81 Answers

SOURCE: how to calculate logarithm values with different base

Like you maybe know in math (I know!) log x base y = log x / log y
so what you need its just input your number (x for example) and log it, than divide log x by log 2.
just: log x / log 2. (by the way in calculator the meaning of log x is log x base 10 the default base is 10)

Posted on Jul 06, 2009


  • 2 Answers


1-press and hold "SET/%" key 2- "set" will appear on screen 3-press "tax+" key 4-type tax amount ie 17.5 5-press "set" key to complete done.

Posted on Sep 04, 2009

Testimonial: "Many thanks. A simple task but without the instructions, difficult. I have saved the instructions so when vat goes back to 17.5% I can change it back."

Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My casio calculator has been discharge so I put it in sunlight then it starting working but as I come inside the room it stopped. please tell me what to do

Shine a bright light on the calculator while indoors to charge up the internal battery. The solar cells don't need sunlight....just light to work.

Jun 17, 2017 | Casio Office Equipment & Supplies

1 Answer

Are this calculator have a battery like AAA or AA energizer battery ? Here photo of the calculator

M815279 - Casio FX-115ES Scientific Calculator.

This link provides the manual for your calculator. The information that you require is on page E-71.

Please check that it is the right calculator before proceeding.

Hope this helps, Nik.


Jul 14, 2015 | Office Equipment & Supplies

1 Answer

Casio DS-120TV calculators are two way power. How do you change the battery?

Hi fred,

Changing the battery will cost you a lot and may not be worth the struggle. Try to buy a new calculator, you can find a lot with the same functions and cheaper.
Casio Df120ter Desk Calculator

Have a nice day !

Jan 12, 2015 | Casio Office Equipment & Supplies

1 Answer

How do i gat into my casio calculator fx82ms to change the battery.

Remove the six screws holding the back, then remove the screw holding the battery cover.

Follow the instructions in Section 19 of the manual.

Jun 24, 2012 | Casio FX82MS Scientific Calculator

1 Answer


Divide both sides by 20m^3 to get h = V/(20m^3).

Apr 22, 2012 | Casio FX9750GII Graphic Calculator

1 Answer

Calculator's battery

On some TI (TInspire) the battery status can be checked on the calculator. On some other TI's the TI connect software to link calculator to a computer can tell you the battery status.
Most calculator do not enjoy this feature.

There exist some cheap battery testers but why buy a new gadget that you might not use often.
As to you, to be on the safe side take a fresh set of batteries with you to the exam hall, or change the batteries just before going to take the exam.

Jul 30, 2010 | Casio Office Equipment & Supplies

1 Answer

Casio calculator ms-8t


after turning on hold RATE SET button (%). type in the tax rate you want. then press RATE SET button again.



Jun 07, 2009 | Casio MS-80TV Scientific Calculator

Not finding what you are looking for?
Office Equipment & Supplies Logo

Related Topics:

190 people viewed this question

Ask a Question

Usually answered in minutes!

Top Casio Office Equipment & Supplies Experts


Level 3 Expert

8091 Answers


Level 3 Expert

85239 Answers

Carlo Barzo
Carlo Barzo

Level 3 Expert

530 Answers

Are you a Casio Office Equipment and Supply Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides