You can enter complex fractions on a TI-Inspire calculator, even though there is not a fraction button. Since a fraction bar essentially means to divide, so the division button is a fraction bar.
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Press MATH and select >Frac. Then press ENTER. This will change your last answer to a fraction. If the decimal is not you last answer, type the decimal and then follow the steps above.
No, there is not a greatest common factor on a TI-30XA.
On my TI-36X, it's 2 yx 1 0 = Thank you.
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4 3/40 = 163/40 On many calculators there is a F <> D key which converts fractions to decimals & vice versa. It's on the TI-30Xa, a fairly common scientific calculator. But assuming you know that .75 is 3/4, .075 is 1/10 x 3/4 = 3/40 and similarly .0075 = 3/400 and so on.