Question about Casio MS-80TV Scientific Calculator

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Casio seem to have a problem with the percentage key

I to have the same problem and have contacted Casio and awaiting an answer I type in 10+10% to get 11.1111 on the MS-7TV this is not correct. I also tryed it on other Casio calculators to get a similar problem. I thought it may be linked to the tax rate calcuation but when I changed this I get the same answer.

I get a correct answer from alternate brands of calculators.

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The issue is the fact that you are adding the %. You need to Multiply it by 1.1 instead of trying to add 10%. This is a wonky equation anyway, because your not specifying what you want to add 10% of. This is why you are getting a weird answer.

Posted on Jun 20, 2009

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From CASIO FAQS:
Why do I get the wrong answer when doing a percent calculation?
Make sure that you are following the correct procedure.
Adding 10%: 200 [x] 10 [%] [+]
Subtract 10%: 200 [x] 10 [%] [-]

Posted on Aug 01, 2014

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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).

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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.

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How to use %


From the manual:

Function: Keys
Answer
Percentage: 100 x 5% 100 x 5 % 5

Add On: 100 + (100 x 5%) 100 x 5 % + 105

Discount:10 - (10 x 20%) 10 x 20 % - 8

Ratio: 30 = 60 x ?% 30 (division key) 60 % 50

% change: 12 = 10 + (10 x ?%) 12 - 10 % 20

Mark-up: 25% mark-up of 120 120 = 25% 160
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Calculating Percentages.


dear tonya,
for example if u want to calculate 5% of 200 chocolates then enter 100 followed by "x"(multiplication symbol) and type 5 followed by "shift =".. u will get answer as 10..try this..

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

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Percentage Key


I've been searching for the solution to this problem, as well. Apperently, there's no user's manual for this calculator. I'm going to call Casio on Monday to see if they can send me some sort of instructions. (800)962-2746 or (609)395-0154



good luck!!

Oct 25, 2007 | Casio MS-80TE Calculator

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