Question about Texas Instruments BA-II Plus Calculator

# Wrong exponential value

There is something wrong with the scientific notation on my calaculator. I put in 0.030377/6.022x10^23 ang get 5.044337429x10^20 then i divide that by 1000 and get 5.044337429x10^17 when the answer should be 5.044x10^-29. How do I fix it??

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• kakima Nov 03, 2012

Could you post the exact sequence of keys you're pressing? Also, you posted this question under two different calculator models. Which one are you using?

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• Texas Instru... Master

Sorry, but there is nothing wrong with the exponential notation on your calculator. There is however a misunderstanding from your part on the priority rule of operations.
The sequence 0.030377/6.022x10^23 is interpreted as (0.030377/6.022)x10^23 while you wanted 0.030377/(6.022x10^23), dividing by Avogadro's Number.

How to fix it. Enter the power of 10 exponent (10^23) using the EE key. In other words Avogadro's Number should be typed in as 6.022 [EE]23. If you do not have the EE key you must use parentheses to enclose the whole number (6.022x10^23) or use the division key twice /6.022/10^23
On a calculator a sequence a/bxc where both operations have the same level of priority is executed from left to right.

Posted on Nov 04, 2012

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Posted on Jan 02, 2017

SOURCE: scientific notation

you want to hit mode not menu and then make sure that normal is flashing instead of SCI and hit enter. so just hit mode then enter and it should be normal

Posted on Jan 14, 2008

z=e over i z= 480 over0.6 z= blank

Posted on Feb 18, 2009

It's been a while since my TI calculator died, but I think you can just hit EE (may be "exp" on your model) followed by =.

Posted on Aug 28, 2009

SOURCE: I have a TI-30XS Calculator

One solution that you might try is to put the scientific numbers in parentheses. For instance open parenthesis, type in the first scientific notation then close parenthesis, next hit the divide key and then open parenthesis and type in the 2nd number in scientific that you are dividing by and then close parenthesis. Hit enter or =. I'm not sure if this will fix your problem, but it is worth a try.

Posted on Aug 29, 2009

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
1.6X10^(-19) 1.6[EE][+/-]19 shows as 1.6 -19

Hope it helps

Posted on Sep 17, 2009

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