Question about Texas Instruments TI-86 Calculator

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How to open (remove) TI-86 Keyboard

The number 1 key sticks to the panel in the up position(when not pressed) on my TI-86. It started about half a year ago. Probably something sticky has got between the button and the front board. At first it was not disturbing me much but now it has got worse. I'm afraid that the key 1 will stop functioning if i don't clean it. I want to remove the front board and clean it.

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Re: How to open (remove) TI-86 Keyboard


Posted on Jul 21, 2008

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Re: How to open (remove) TI-86 Keyboard

There are screws on the back. unscrew those carefully and then pull the two sides apart and start cleaning. GOOD LUCK

Posted on Feb 12, 2008

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I have a TI-86, whenever i input - it shows Ans- and then it show that is an error. how can i fix it.

The - key is for subtraction, an operation that needs two numbers. If you press - as the first key on a line, the calculator assumes you want to subtract something from the previous answer, Ans.

If you want to enter a negative number, use the (-) key on the bottom row of the keyboard, just to the left of the Enter key.

Apr 05, 2016 | Texas Instruments TI-86 Calculator

1 Answer

How to calculate cube root on simple calculator

That depends on how simple a calculator. I'll give some examples below for calculating the cube root of 8.

On a TI-86, press 3 2nd [MATH] F5 MORE F4 8 ENTER

If the calculator has a "^" or "y^x" key, raise 8 to the 1/3 power. Again, on the TI-86, press 8 ^ ( 1 / 3 ) ENTER

If the calculator has a logarithm key, take the logarithm, divide it by three, then take the antilogarithm. Again, on the TI-86, press 2nd [e^x] ( ln 8 / 3 ) ENTER

On a slide rule, place the hairline over the number on the K scale and read the cube root on the D scale.

Jan 10, 2013 | Texas Instruments TI-86 Calculator

1 Answer

How to calculate 1.025^4

How to Use a TI-30XA
The TI-30XA is a scientific calculator with many functions. You can calculate problems with fractions and decimals, as well as solve problems of probability and functions. A scientific calculator computes the number sentence you type in using the order of operations: parentheses first, then roots and exponents, then division and multiplication and, finally, addition and subtraction.

  1. How to Use a TI-30XA
    • 1

      Press the [ON/C] key to turn on the calculator. Press the [OFF] key to turn it off. To use the calculator in solar mode, put the solar panel in the light and then press the [ON/C] key. To turn it off when in solar mode, slide the calculator cover back on and it will automatically shut off.

    • 2

      Replace the batteries by first removing the cover and placing it face down. Use a Phillips-head screwdriver to unscrew the back panel. Remove the back panel and change the batteries. Screw the back panel back on. Press [OFF] [ON/C] and [ON/C].

  • Use the basic operation keys for addition [+], subtraction [-], multiplication [x] and division [/]. To change the signs of your values from positive to negative or vice versa, press the [+ -] key before the numbers you enter. Use the parentheses, [(] and [)], to command the calculator to solve what is inside the parentheses first. Press the [=] to solve the number sentence you entered into the calculator.

  • 4

    Find percents of a number by first typing in the number, then [x], then the percent number, [2nd], [%] and, finally, [=]. The [2nd] key allows you to use the commands that are written above each key. For example, to find 20% of 100, type in 100 [x] 20 [2nd] [%] [=] and the display will show the answer, 20.

  • 5

    Turn decimals into fractions by entering the decimal value, then pressing the [2nd] and [F D] keys, then [=]. Turn the fraction back into a decimal by pressing [2nd] and [F D] again. For example, to turn 0.5 into a fraction, type in 0.5 [2nd] [F D] [=].

  • 6

    Turn mixed numbers into improper fractions by entering the mixed number first. Type in the whole number, then the [a b/c] key, then the numerator, the [a b/c] key again and the denominator. Next, press [2nd] [d/c] [=], and the calculator will convert your mixed number into an improper fraction. Press [2nd] [d/c] again to turn it back into a mixed number. For example, to turn 1 1/2 into an improper fraction type in 1 [a b/c] 1 [a b/c] 2 [2nd] [d/c] [=], and the display will show the answer 3/2.

  • 7

    Switch the notation setting of the calculator between engineering, scientific and floating. To select scientific notation, press the [2nd] and [SCI] keys; this will display your answers in scientific notation as a number between 1 and 10 to a power of 10. Press [2nd] [ENG] to switch to the engineering setting; this setting displays values as a number with an exponent that is a multiple of 3. Press [2nd] [FLO] to switch to the floating setting. This is considered standard notation and will display the answer as a standard number.

  • 8

    Use the left arrow key to go back and delete numbers to the right of the cursor that you typed into the display. This must be done before you press [=]. To clear the screen, values and operations, press [ON/C] and [ON/C] again in battery mode, or [CE/C] and [CE/C] again in solar mode.

  • Hope it helps your problem. Thanks!

    Jan 03, 2013 | Texas Instruments TI-30XA Calculator

    2 Answers

    Hos do I adjust the screen brightness?

    Press and release the 2nd key and then press the up-arrow to darken or the down-arrow to lighten. Repeat as needed.

    Sep 20, 2012 | Texas Instruments TI-86 Calculator

    2 Answers

    Converting negative deg F to deg C produces conversion error

    If your measurement are negative use parentheses such as, (-4) degrees Fahrenheit converted to Celsius should = -20. Where as 4 degrees Fahrenheit equals -15.5 degrees Celsius. the parentheses are not needed if your measurement is positive.

    Dec 20, 2010 | Texas Instruments TI-86 Calculator

    1 Answer

    Ti-86 screen turned black after replacing the batteries

    Turn the calculator on. Press and release the 2nd key. Press and hold the down-arrow key until the screen lightens. If you go too far, press and release the 2nd key and then press and hold the up-arrow key.

    Sep 13, 2010 | Texas Instruments TI-86 Calculator

    2 Answers

    The screen on my TI-86 calculator is black when I turn it on. What do I do?

    You can adjust the contrast on the screen of your TI86 by following the procedure below.

    Adjusting the Contrast
    1 Press and release the yellow [2nd] key.
    2 Press and hold UpArrow or DownArrow (above or below the half-shaded circle).
    ¨ To darken the screen contrast, press and hold UpArrow.
    ¨ To lighten the screen contrast, press and hold DownArrow.

    Hope it helps.

    Nov 04, 2009 | Texas Instruments TI-83 Plus Calculator

    1 Answer

    Calculator (TI-86) will not come on.

    Make sure batteries are fresh (unspent)
    Make sure batteries are inserted correctly, respecting the + - diagram.
    To adjust contrast:
    1. Press and release [2nd[ key
    2. Press and hold [UpArrow] key to darken screen or press and hold [DownArrow] to lighten it. Keep it until contrast is to your liking.
    Hope it helps.

    Mar 15, 2009 | Texas Instruments TI-86 Calculator

    1 Answer

    TI 86

    Press "2ND" "MATH" "F3" to invoke the Angle menu.

    Enter the number of degrees, press "F3", enter the number of minutes, press "F3", enter the number of seconds, press "F3", then press "ENTER".

    Feb 15, 2008 | Texas Instruments TI-86 Calculator

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