Why does the calculator not display decimal answers and only fractions, and why won't it square numbers that aren't perfect squares

Hello, the sd key will change fractions to decimals and back if needed. The calculator will simplify square roots that are not perfect squares and if you need a decimal answer then press the sd key and if will convert it to a decimal.

Is there a comma separator - thousands function for millions and billions,etc. for example 50,000,000,000?

This is not a business calculator - not sure why you'd want a comma separator when you'd be using scientific notation: 5x10^10 for example.

How is this different than the fx-300ESPLUS2 ?

I am not familiar with the fx-300ESPLU52. You might be able to go to the Casio website to get information on how they are different. This one (the fx-115) has many features which I have not yet used.

can it used in SAT exam?

I'm a retired hs teacher. I've bought this model two times for my own kids because it met their needs and can be used during standardized exams such as the SAT.

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🔢 Elevate your calculations with precision and style — don’t get left behind!

BUILT FOR PRECISION - Includes 40 metric conversions and scientific constants to ace every calculation.
STEP BACK MULTI REPLAY - Edit and recalculate with ease using the intuitive multi-replay feature.
ECO FRIENDLY RELIABLE - Solar-powered with battery backup ensures uninterrupted performance anytime, anywhere.
POWERHOUSE OF FUNCTIONS - Over 280 built-in functions covering everything from statistics to complex numbers.
TEXTBOOK PERFECT DISPLAY - See equations exactly as in your textbooks for flawless comprehension.

The Casio fx-115ESPLS2 is a sleek, advanced scientific calculator featuring a 16-digit, 4-line natural textbook display, over 280 versatile functions, and a multi-replay system for easy editing. Solar-powered with battery backup, it supports complex calculations including matrix, vector, and statistical data, making it an essential tool for professionals and students aiming for accuracy and efficiency.

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Brand	Casio
Manufacturer	CASIO
Model	FX-115ESPLS2
Model Name	FX-115ESPLS2
Model Year	2020
Product Dimensions	22.86 x 13.97 x 0.25 cm; 104.33 g
Batteries	1 LR44 batteries required. (included)
Item model number	FX-115ESPLS2
Number of items	1
Standing screen display size	6.5 Centimetres
Display Type	LCD
Power Source	Solar Powered
Batteries Included	Yes
Batteries Required	Yes
Battery cell composition	Alkaline
Material	Plastic
Does it contain liquid?	No
Includes Rechargeable Battery	Yes
Manufacturer	CASIO
Item Weight	104 g

Casio fx-115ESPLS2 White Advanced Scientific Calculator with Natural Display

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