When i use the percentage button, it calculates at a false rate. 100+10%=111.11111 that's what the calculator tells me. how do i fix this?

I also was confused when trying to subtract percentages using the % key. I have never had a calculator function like this and I have had several other Casio models. Can confirm (X x Y% +/-) will get you the correct total "10 x 10% -" will get you 9 as an answer just as "10 x 10% +" will get you 11. Annoying to have to take an extra step, whatever Casio I'm sure you have your reasons.

On this calculator 50-10%=400 and 50+10%=55.55. What am I doing wrong?

To add or subtract a % from a number, using the % key, you first have to multiply the number by the %, then press + or –. Examples: To calculate 50 plus 10%, enter 50 x 10% (answer 5), then press + (answer 55). To calculate 50 minus 10%, enter 50 x 10% (answer 5), then press – (answer 45).

does it have a back button

yES, IT DOES Yes, it does. The BACKSPACE (ERROR CORRECTION) KEY you're looking for is the ARROW directly to the left of the TAX- key. Each press erases the last entered digit so it can then be reentered correctly.

Is this completely flat or is it curved at the top?

The display window is curved at about a 25 degree angle for ea\asy reading.

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Casio MS-80B Standard Function Desktop Calculator

Product ID: 732857058

Details

Brand
Casio
Calculator Type
Standard
Colour
silver
Power Source
Solar Powered
Screen Size
3.25

💱Tax & currency conversion

🔋Dual solar & battery power

🖥️Large 8-digit clear display

Description

🧮 Elevate your calculations with style and precision!

EFFORTLESS OPERATION - Comfortable keys with key rollover and dedicated on/off buttons for smooth use.
SLEEK PROFESSIONAL - Silver-metallic finish complements any modern office or home desk.
POWER THAT NEVER QUITS - Solar plus battery backup keeps you calculating even in low light.
SEE EVERY DIGIT CLEARLY - Extra-large 8-digit display ensures no mistakes in your numbers.
BUSINESS READY FUNCTIONS - Built-in tax, currency conversion, and profit margin keys streamline your workflow.

The Casio MS-80B is a compact, dual-powered desktop calculator featuring a large 8-digit display, tax and currency conversion functions, and a sleek silver-metallic design. Designed for professionals and home users alike, it offers reliable performance with solar plus battery power, easy-to-use keys, and essential business functions like profit margin and memory keys.

Specifications

ASIN	B003822IRA
Brand Name	Casio
Calculator Type	Standard Function
Colour	silver
Customer Reviews	4.7 4.7 out of 5 stars (13,841)
Display Type	LCD
Global Trade Identification Number	00079767187385
Item Weight Unit of Measure	120 Grams
Manufacturer	CASIO
Manufacturer Part Number	MS-80B
Model Name	MS 80B
Model Number	MS-80B
Number of Batteries	1 Product Specific batteries required.
Power Source	Solar Powered
Screen Size Unit of Measure	3.25
UPC	079767187385

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