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.

ASIN	B003822IRA
Batteries	1 Product Specific batteries required.
Best Sellers Rank	#616 in Office Products ( See Top 100 in Office Products ) #3 in Basic Office Calculators
Customer Reviews	4.7 4.7 out of 5 stars (14,080)
Date First Available	January 24, 2004
Department	Unisex-Adult
Is Discontinued By Manufacturer	No
Item Weight	4.2 ounces
Item model number	MS-80B
Manufacturer	Casio
Product Dimensions	5.4 x 4 x 1.25 inches

MS-80B Calculator – Desktop Calculator with Tax & Currency Tools | General Purpose | Large Display | Ideal for Home, Office & Everyday Math

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