Question about Texas Instruments TI-30 XIIb Calculator

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Sharp scientific calculator

I have a fraction question. If I enter 1/8 and then =, I of course get .125. My question is, how do I go the other way? If I enter .125, what key do I press to get the fraction, 1/8?

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  • geedah Jan 03, 2008

    How do i convert decimals into fractions? Ex. .80=? fraction



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There is a button that switches answers from fraction to decimal and decimal to fractions. It is hidden under the PRB(probability) button and is labeled F<>D. Push [2nd] PRB to get to it. For your example, you would enter .125 [2nd] PRB then enter and you get 1/8.

To get an improper fraction(27/2) to a mixed number and the other way around. Use the same process as above except you push use the button hidden under the A b/c button.So 27/2 would become 13 1/2.

Posted on Oct 16, 2008

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Where is the fraction key

Posted on Oct 07, 2008


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For such a sophisticated calculator (computer) a simple thing like entering a fraction seems too difficult to explain. There are a great number of scientific calculators that handle fractions easily.
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Press MODE then F3 CAS.
In the CAS screen, move cursor to the _numeric option. If it is cheked, uncheck it by pressing F3:Check.
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Now if you enter 1/5 then press the ENTER key you will see 1/5. But if you add to that 13/7 you will see 1/5+13/7 and the result will not be calculated. To calculate the resulting fraction you must press EVAL (Green Left Shift ANS) ENTER.
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If you have them then you can calculate with fractions.

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15 [a b/c] 7 [a b/c] 19 [a b/c] should allow you to enter 15 and 7/19.
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