Question about Casio FX991ES Scientific Calculator

# Describe casio fx-991 es battery replacement

What kind of battery which is best suit for long last life?

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### k24674

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• Casio Master

Ah! that perennial desire for eternity. The calculator uses solar power. It also have a battery. Under normal circumstances you won't need a battery, may be if you are living through a long Nuclear Winter.
Any way, just get a battery with the same characteristics as the one that shipped with the calculator: voltage, thickness, diameter. That is what counts.

Posted on Dec 17, 2013

### k24674

SOURCE: How do i calculate antilog

For common logs (logs in base 10) use the 10^x function : Press [SHIFT] [Log] to access it.
For natural logs, use the exponential function. Press [SHIFT][ln] to access it.

Posted on Dec 03, 2010

### k24674

SOURCE: how do i multiply to

The enclosed screen capture shows all the possible dimensions for matrices on the Casio FX-991ES. As you can see the maximum dimension of any matrix is 3. You can only create matrices with dimensions less than or equal to 3.

Posted on Dec 01, 2010

### Christy Fredericks

Hello,

There are many different functions...

after using the dropdown menu for this make and model.

Good Luck!

Posted on Oct 18, 2010

### k24674

Hello,
It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

Posted on Sep 17, 2009

Testimonial: "thanks alot!! "

### k24674

SOURCE: How I can memorize my

Sorry, but you cannot.
You can type in a formula that involves the memory variables X,Y, A, B,C,D, E, =, . Such a formula is meant to be evaluated to get a solution (X by default). Once you type the formula you press the Shifted function SOLVE and you will be prompted for the constants, for Y etc. when you press the EXE/= key you get the value of X.
If you turn off the calculator or change the calculation MODE, it is wiped out of memory.

To make a long story short, you cannot STORE formulas in the calculator. Better try to memorize them (commit then to YOUR OWN memory).

Posted on May 23, 2011

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