Solution 34857: Converting an Imaginary Number From Decimal to Fraction on TI-84 Plus C Silver Edition.
How do I convert an imaginary number from decimal to fraction on a TI-84 Plus C Silver Edition?The TI-84 Plus C Silver Edition can convert imaginary numbers to fractions by following the example below.
Convert .5i to a fraction.
• Press [.]  [2ND] [i].
• Press [MATH]  [ENTER].
Please see the TI-84 Plus C Silver Edition guidebook for additional information.