Connecting a calculator to the keyboard of a computer is not possible unless you have a special program that allows you to use the calculator as an input. If you own a TI-84, you can download a free program called fraction to a mixed number calculator https://www.calculator.io/mixed-number-calculator/ which allows you to use the calculator as an input to perform mathematical calculations on your computer. Other calculators may also be able to do the same thing, though details may vary
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Connecting a calculator to the keyboard to perform mathematical calculations