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

Product ID: 697532078

Details

Brand
Casio
Calculator Type
Colour
White
Power Source
Solar Powered
Screen Size
6.5

🔢16-digit, 4-line natural display

☀️Solar plus battery backup

⚙️280+ advanced functions

Description

🔢 Elevate your calculations with precision and power — because your work deserves the best.

STEP BACK EDIT - Multi-replay lets you backtrack and edit calculations seamlessly—never lose your flow.
DURABLE PORTABLE - Sleek white design with a slide-on hard case for protection and professional style on the go.
ALWAYS READY ALWAYS ON - Solar-powered with battery backup ensures uninterrupted performance wherever you work or study.
POWERHOUSE OF FUNCTIONS - Over 280 built-in functions including complex numbers, statistics, and matrix calculations to tackle any challenge.
TEXTBOOK PERFECT DISPLAY - Natural textbook display mirrors your work exactly, eliminating guesswork and boosting accuracy.

The Casio fx-115ESPLS2 is a professional-grade scientific calculator featuring a 16-digit, 4-line natural textbook display and over 280 advanced functions. It supports complex number, matrix, and statistical calculations, with a multi-replay function for easy editing. Powered by solar energy with battery backup, it ensures reliability in any environment. Compact and protected by a slide-on hard case, it’s designed for professionals and students who demand accuracy and efficiency.

Specifications

ASIN	B086Z79HXS
Brand	Casio
Brand Name	Casio
Calculator Type	Engineering/Scientific
Colour	White
Customer Reviews	4.8 out of 5 stars 7,233 Reviews
Display Type	LCD
Enclosure Material	Plastic
Global Trade Identification Number	00889232609690
Item Type Name	Advanced Scientific Calculator
Item Weight Unit of Measure	6.05 Ounces
Manufacturer	CASIO
Manufacturer Part Number	FX-115ESPLS2
Model Name	FX-115ESPLS2
Model Number	FX-115ESPLS2
Number of Batteries	1 LR44 batteries required. (included)
Number of Items	1
Number of Packs	1
Power Source	Solar Powered
Screen Size	6.5 Centimetres
Screen Size Unit of Measure	6.5 Centimetres
UPC	889232609690

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