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Calculating percentages I have a Casio MJ 100. It seems incapable of accurately calculating percentages. If I type in 100 minus 20% it answers 400! Is it time to throw it away?

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Re: calculating percentages

How can i change or fix an exchange rate in Xasio JF - 100TE calculator

Posted on Jul 10, 2008

Re: calculating percentages

Type 100 x 20%, and then hit the minus button

Posted on Jun 20, 2008

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It is used for calculating markup. For example, if you have an item at $100 and have a 20% markup, you get $120.

Sep 20, 2015 | Casio Calculators

1 Answer

When I try to make 100 + 10% answer is 111.11111... and not 110, How do i correct it?

best way to calculate percentages quickly is to multiply base number (100) by 1.xx (where xx is the percentage desired - here it would be 10 or just 1)


Works on every calculator every time.

Mar 03, 2015 | Casio MS-10VC 10-Digit Display Calculator,...

1 Answer

Minus 20% of 175.00 using the percentage key

On most Casio calculators you must type: '175 x 20 % -' (and '+' is for adding a percentage)

Feb 18, 2015 | Casio MS-80S Calculator

1 Answer

Percentages are not correct

The calculator is giving you exactly what you asked for, which is not the same thing as what you meant to ask for.

The SHIFT ( sequence converts a percentage to a decimal. 20% is 0.2, which added to 100 gives 100.2, as the calculator shows. If you want to increase 100 by 20%, you need to enter it as 1 0 0 + 1 0 0 * 2 0 SHIFT % = . See example 006 of the Appendix:

You may also download a copy of the manual at

Feb 25, 2014 | Casio FX83ES Scientific Calculator

1 Answer

Casio fx-82ms calculator does not give me an answer when i use the percentage button . example if i type 0.25/ 100% i get 0.25 instead of the right answer 25

Here is a sample of the percentage calculations that the calculator can perform. You will not see among them the conversion from decimals to percentages.
To convert from decimals to percents move the decimal mark 2 places to the right and append the % sign.
To convert from percents to decimals, move the decimal mark 2 places to the left.

Sep 28, 2013 | Casio FX-82MS Scientific Calculator

1 Answer

I have a Casio FX83ES Scientific Calculator and I am trying to work out 1 out of 1700 as a percentage using it. When I type in 1/1700 I get 1 over 1700. I press S<>D and then I get...

1÷1700 expressed as a decimal is 0.000588235, which is 5.882...×10^-4. [NB not 10^4]

To convert this to a percent, remember that "per cent" means "per 100" which also means "divide by 100". To keep the answer correct, if you are dividing by 100 you must also multiply by 100.

The get the answer in percent, you must therefore multiply the previous answer by 100 to get 0.00588235 percent. (or 5.882...×10^-2 percent).

Mar 30, 2011 | Casio FX83ES Scientific Calculator

1 Answer

How change percentage (tax) rate on Casio-1100TV?

FINALLY figured out how to change the tax rate! Press AC. Press and hold the Rate Set (%) button UNTIL THE CURRENT TAX RATE IS DISPLAYED. Enter the new rate you want (such as 7.5). Press the Rate Set (%) button again.

Mar 05, 2010 | Casio Calculators

2 Answers

How do I get this calculator to substract

Big calculators work a little different than handheld calculators. Like the above commentor explained, if you have a basic "whats 100 minus 20?" You have to entered as 100 + 20 -- And when you hit the minus button at the end, it will give you the total. 100 is the positive number, and the 20 is the negative number that your subtracting. Also you can hit 20 -- 100 + and get the same total because you entering 20 as the negative and 100 as the positive, just in reverse.

Jul 27, 2009 | Casio HR-100TEPlus Calculator

2 Answers

My calculator will not let me add or subtract percentages.

I have a Casino MS-80S and yea, the percentage works different. As example to take 100 and subtract 10%, this is what I do: 100 X 10% - and then I get the answer 90 after I press the minus key. To add the percentage instead, 100 X 10% + will give me an answer of 110, after I press the plus key.

Apr 04, 2009 | Casio HR8TM Calculator

7 Answers

Percenteg Function problem in my Casio MJ - 120 Model Calculator

I found it by myself, I can help you.
1. Press (AC)
2. Hold (Rate) for about 2-3 second
3. Press (Set / TAX+)
4. Input the tax rate
5. Press (Set / TAX+)
6. Hold (Rate) for about 2-3 second again
7. Press (Set / TAX+) again
And Then you can test the rate .

From Thailand

Mar 12, 2009 | Casio Calculators

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