Assuming you want to use fractions in your equation, let's use an example: 5/7 + 10/7
Basically, you don't want it to divide the numbers first then add, because they are supposed to be fractions. Therefore you press the parentheses key and type: "5" "divide" "7" then the close parentheses sign. And you continue on, using the parentheses whenever you are symbolizing fractions.
However, if you want to make your answer into a fraction.. it's a lot easier. Simply input whatever you are solving and then press enter. After wards, press the "MATH" key and enter when FRAC is highlighted. It should be #1. And there you have it, using fractions on TI-84 Plus Silver Edition :)
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42 + 42 = 84
Click the 2ND button and then hit the + button. Then a menu called "Memory" should come up. Click on "Clear Entries" and it will bring that up on the screen. But then you need to press enter in order to clear the data,so click enter. Then it will have it all deleted and you can click the clear button to get off the screen or click 2ND and the MODE button to do the same thing.
84
Pull the Batteries Out...
14x6=84+2=86