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-80S Calculatrice

Product ID: 225310727

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Details

Brand
Casio
Colour
Brushed Nickel
Calculator Type
Standard
Power source
Battery Solar
Screen size
3.25
Number of batteries
1 Product

🔋Battery backup

☀️Solar-powered

8️⃣8-digit display

Description

Calculate with confidence! 📊

SLEEK DESIGN - A modern look that fits any workspace.
USER FRIENDLY - Intuitive layout for effortless calculations.
RELIABLE BACKUP - Never miss a calculation with battery support.
CLEAR VISIBILITY - Easily read your results on an 8-digit display.
ECO FRIENDLY POWER - Harness the sun's energy with solar power!

The Casio MS-80S is a solar-powered desktop calculator featuring an 8-digit display and battery backup, ensuring reliable performance for all your calculation needs. Its sleek design and user-friendly interface make it a perfect addition to any professional workspace.

Specifications

Number of Batteries	1 Product Specific batteries required.
Display Type	LCD
Power Source	Solar Powered
Screen Size	3.25
Calculator Type	Standard Function
Item Dimensions L x W	5.79"L x 4.06"W
Material	Plastic
Color	Brush Nickel

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