Question about Texas Instruments TI-30XA Calculator

# HELP, I can't seem to figure out scientific notations with my Texas Instrument TI-30XA. I've searched for hours on the web. Here's the problem: 7.82 x 10^10 / 63.55 = 1.23 x 10^9. But when I input 7.82 x 10 EE 10 / 63.55 = 1.23 x 10^10. I keep coming up with an extra ^10. What am I doing wrong?

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• Texas Instru... Master

Hello,
The error comes from the lack of understanding of the meaning of the notation used by the calculator manufacturers.
The [EE] is a "shorthand" notation for times 10 to the power of .
To convince you of it try entering

1[EE]0 [=] this is 1*10^0=1*1=1
1[EE]1 [=] this is 1*10^1=1*10=10
1[EE]2 [=] this is 1*10^2=1*100=100

When you enter 7.82x10[EE]10
you are calculating
7.82*10*1*10^10=7.82x10^11.

Hope it helps.

Posted on Nov 13, 2009

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Posted on Jan 02, 2017

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Hello,

1. To convert a number to scientific equation, use [2nd][Sci]
Exemples 12345 [=] screen shows 12345 Then [2nd][Sci] coverts it to 1.2345 ^04 to the power 4.
2. To enter directly a number in scientific notation (e.g. -1.2345 X10^(-65) a very small number) you use the [EE] key 1.2345[+ /-][EE][+/-]65 shows as -1.2345 -65
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Hope it helps

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If you mean using the "EE" key it's straightforward.

To enter scientific numbers, enter the number, then press EE, then the exponent value. The TI-30XA will stay in scientific display until you "clear" or turn it off. It will also switch to scientific notation if you multiply big numbers that exceed the display.

E.g. Input 3, EE, 10, X, 3, EE, 10, =, gives you the answer 9 times 10 to the power 20. Press the "square root" key and you will get back 3 times 10 to the power 10.

You can mix entries too, e.g. 3, EE, 10, X, 2, =, gives you 6 times 10 the power 10....

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