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 Desktop Calculator, Tax & Currency Tools | General purpose calculator with large display; ideal for home, office & everyday math

Product ID: 1147653

Details

Brand
Casio
Calculator Type
Standard
Color
Brush Nickel
Power Source
Solar Powered
Screen Size
3.25

💰built-in tax & currency tools

🧮8-digit large display

☀️solar powered, eco-friendly

€ 24.77

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🧮 Power your productivity with precision and style!

ECO SMART SOLAR POWER - Never worry about batteries again—powered by ambient light for uninterrupted use.
EFFORTLESS NUMBER ENTRY - 3-digit comma marker and key rollover ensure smooth, error-free input every time.
COMPACT STYLISH DESIGN - Brush nickel finish fits seamlessly on any desk, blending professionalism with modern aesthetics.
TAX CURRENCY CALCULATOR - Instantly calculate tax and currency conversions to stay ahead in financial decisions.
CRYSTAL CLEAR 8 DIGIT DISPLAY - See every number with precision and ease, perfect for fast-paced office tasks.

The Casio MS-80B is a sleek, solar-powered desktop calculator featuring a large 8-digit LCD display, built-in tax and currency calculation tools, and user-friendly functions like key rollover and comma markers. Ideal for home, office, and everyday math, it combines eco-conscious design with professional-grade performance.

Specifications

ASIN	B003822IRA
Best Sellers Rank	#1,072 in Office Products ( See Top 100 in Office Products ) #3 in Basic Office Calculators
Brand	Casio
Built-In Media	MS-80B Mini Desktop Calculator (1)
Calculator Type	Standard Function
Color	Brush Nickel
Compatible Devices	1
Customer Reviews	4.7 4.7 out of 5 stars (14,269)
Display Type	LCD
Enclosure Material	Plastic
Global Trade Identification Number	00079767187385
Item Dimensions L x W	5.79"L x 4.06"W
Item Type Name	Solar Desktop Calculator with 8-Digit Display
Item Weight	120 g
Manufacturer	Casio
Mfr Part Number	MS-80B
Model Name	Casio MS-80B Standard Function Desktop Calculator,Black 147D×103W×28.8H mm
Model Number	MS-80B
Number of Batteries	1 Product Specific batteries required.
Power Source	Solar Powered
Screen Size	3.25
UPC	079767187385
Unit Count	1 Count
Warranty Description	One year from date of purchase

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€ 24.77

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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