Question about Texas Instruments TI-83 Plus Calculator

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I have to use eng mode. When I type (54.2*10ee-3)*(37*10ee9) I get 2.0054ee11. My teacher says that I should have 2.0054ee3. Does my calculator is broken?

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No! Your calculator is not broken. However you are not using the EE button correctly, or you are not aware of its meaning.
The EE key is a shortcut for 10 to a power and the 10 is already included.

Here is an example.To enter the [EE] you use [SHIF][,] where the comma [,] is the key between [SIN] and [7] in the column under [MODE]. To enter a negative exponent you use the change sign key (-), the one at the bottom of keypad below 3 and to the right of the decimal mark [.]
To enter 54.2 x10^(-3) you type in 54.2[,] [(-)]3
To enter 37x10^(9) you type in 37[SHIFT] [,]]9

The correct result is 2.0054x10^9 and your calculator will show you 2.0054E9

However by typing in 54.2*10[EE]-3 your are in fact entering 54.2x10x10^(-3) and by typing 37*10[EE]9 you are entering 37*10*10^9 and your final result is in fact multiplied by 100, hence the value you are getting 2.0054E11

Posted on Aug 29, 2010

  • k24674 Aug 29, 2010

    54.2[,] [(-)]3 should be 54.2 [SHIFT[,] [(-)]3

  • johnnybee1 Aug 29, 2010

    Yes, we got the same thing now. We just realize something. THe result is in Becquerel and we have to put it in Megabecquerel. That's why the teacher got 2.0054EE3 :) tnx!



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