# Instruction manual Is there a website for the ca656 sentury calculator to tell instructions, what buttons are for what?

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### How to calculate mean using sentry ca656 calculator

press shift and cal in stat mode then presss value and them m+ then value the m+ them press x-m buttom its mean......

Feb 07, 2012 | Sentry CA656 Calculator

### How do you calculate the square root?

First of all, here is a direct link to the ONLINE USER'S MANUAL for that model:

http://education.ti.com/guidebooks/scientific/30xii/30xiiqrg-eng.pdf

To view the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated or the contents of the Owner's Manual.

See page 3 of the ONLINE USER'S MANUAL for detailed instructions on how to calculate the square root of a number.

Basically you just do the following:

Press the SECOND FUNCTION button (2nd),
Then press the SQUARE ROOT button (looks like a checkmark),
Then type in the number you want the square root of (say 25),
Then hit ENTER.

Thank you very much and good luck.

Apr 17, 2011 | Texas Instruments TI-30 XIIS Calculator

### How to use sentry ca 656 calculator for exponential forms in positive and negative ? when i am trying to do 2 to the power of 3 , it is giving me answer as 2000.for this i pushed 2 button than EXP than 3 ....

The EXP key is what's marked EE on most calculators and adds a decimal exponent. 2 EXP 3 means 2*10^3 which is 2000 as you've discovered.

You need to use the x^y key (just above DEL) instead.

Sep 22, 2010 | Sentry CA656 Calculator

http://www.sentryindustries.com/pdf/instructions/CA656_instructions.pdf

Sep 03, 2010 | Sentry CA656 Calculator

### Is there a combination button on this calculator?

Hello,

Oct 05, 2009 | Sentry CA656 Calculator

### I'm an older student.....in my 50's. I am taking classes to complete my bachelor's degree in nursing, something I should have done 30 years ago. Better late than never, right? Anyway, I found my son's TI...

Hi Anne,
here are some tips to use your TI 83 calculator. Patiently follows this:

1. Press ENTER to find out the answer to an expression.
2. Press 2ND before pressing a button to use the function in yellow above the button.
3. Press ALPHA to enter in letters.
4. Press 2ND before pressing Alpha to turn on Alpha lock, which will automatically use the alpha mode until you press a directional key or ALPHA again.
5. Press 2ND and then hold up or down to adjust the screen contrast accordingly.
1. Press MODE to go to a menu that allows to change graphing modes, degree modes, and notation modes among other things.
2. Enter in a number then press STO> then enter in a letter and hit enter to store values in variables.
3. Press Y= and enter in a function and then press GRAPH to view it. If you are having trouble viewing it, press WINDOW and adjust the graph's window.
Thanks,

Cherile

Aug 30, 2009 | Texas Instruments TI-83 Plus Calculator

### Won't work

I bought a new product and I will never purchase this brabnd again.

Sep 13, 2008 | Sentry CA656 Calculator

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