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# Will not do simple math

Every time I try to calculate 1000-490= It turns the 1000 into -1000 and will not do the calculation at all unless I punch it in like 1000-490+= but then the answers are all negatives.

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• Anonymous Jul 04, 2008

= not working

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### Anonymous

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Yeah, this calculator is kind of odd in that the keys to the left of the numbers ([÷], [×] and [=]) work more like standard calculators, but the keys to the right ([-] and [+]) work more like they're RPN (more common on HP calculators). To calculate 1000-490, type "[CE/C] 1000 [+] 490 [-]". What happens is this: after clearing then entering 1000, the [+]adds it to the last result (in this case 0), giving us 1000. This number is saved when you enter 490, and pressing [-] subtracts it from the last result (1000), giving you 510.

Posted on Feb 14, 2007

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× ## Related Questions:

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

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

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Sounds like you could have \$100.00 in your memory. The LCD will show your current calculation but the print out might include anything you added to M+/-. Try clearing your M*
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Press the MATH key to bring up the Math menu. Option 3 gives you cubed, option 4 gives you cube root, option 5 gives you nth root.

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### I am trying to get the calculator in "basic math" mode. displaying the answers in "basic form" unless i am selecting otherwise.

Hi,
The calculator has two Input/Output modes: MthIO and LineIO. Since I do not know exactly what you mean by "basic math" mode or "basic form" I must summarize some properties of each mode so that you can recognize your "basic math" mode.
1. In MthIO, you have access to the multistory templates to enter fractions with a horizontal fraction bar etc. the exponents for the powers are raised above the main line, etc.
2. In LineIO, what you enter in calculator is all on the same line, fraction and radical results are displayed as decimal numbers, etc.
The calculator is by default in the MathIO mode. If it not, you can restore it by pressing the key sequence: [SHIFT][MODE] (SETUP) and select [1:MthIO].
To set the LineIO as the default, you press the key sequence: [SHIFT][MODE] (SETUP) and select [2:LineIO].

Hope it helps.
Thank you for rating the solution.

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Hello,
Unlike other, less sophisticated calculators, the TI83Plus /TI84Plus /TI84Plus Silver Edition do not have a simple key or a command for improper fractions. However there is a command -->Frac accessible through [MATH] key [1:-->Frac] that expresses a result in a proper fraction format.

Here is how you would enter you calculation
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You can also ease a bit on the typing by mentally adding 3 and 4
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You should know about the other command that converts a fraction in decimal format. [MATH][2:-->Dec][ENTER]
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Hope it helps

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Hello,
Try resetting calculator to default configuration.
[2nd][MEM][7:Reset][2:Defaults][2:reset]. Then [CLEAR] screen.
Hope it solves your problem.

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