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—because precision is the new power move.

ECO SMART POWER - Solar-powered with battery backup means uninterrupted performance wherever you work.
NEVER LOSE YOUR FLOW - Multi-replay lets you backtrack, edit, and recalculate without missing a beat.
READY FOR ANY CONVERSION - 40 metric conversions and 40 scientific constants keep you versatile and precise.
SEE IT LIKE YOUR TEXTBOOK - Natural textbook display ensures every formula and result looks exactly as you learned it.
MASTER COMPLEX CALCULATIONS - 280+ functions from fractions to matrices empower your problem-solving prowess.

The Casio fx-115ESPLS2 is a sleek, white advanced scientific calculator featuring a 16-digit, 4-line natural textbook LCD display. With over 280 functions including complex math, statistics, and matrix operations, plus multi-replay and extensive conversion capabilities, it’s designed for professionals and students who demand accuracy and efficiency. Solar-powered with battery backup, it ensures reliable performance in any setting.

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Display Size	6.5 Centimeters
Color Name	white
Item Shape	Right Angle
Batteries Included	Yes
Batteries Required	Yes
Brand	CASIO(カシオ)
Manufacturer	CASIO
Item Model Number	FX-115ESPLS2
Model Year	2020
Size	1"x3.3"x6.5"
Display Type	LCD
Material	Plastic
Product Dimensions	22.86 x 13.97 x 0.25 cm; 104.33 g
Item Weight	0.23 Pounds

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

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