Hit the second button, it allows all the keys on the TI-83 to have a second function.
Now, hit the plus button. There should be a MEM on top of it, this stands for memory.
Now scroll down using the arrow keys to the 7th option, which says reset.
It will confirm that you want to clear the RAM. Then press YES.
Your TI-83 plus is reset.
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Some TI83's can be set up differently, so it is highly recommendable to read the user guide for the TI83 in question. The user would need to go into the VarStat option and enter all the appropriate fields to have the calculator bring in the appropriate variables and totals.
Press MODE and select NORMAL at the top. (You may notice that SCI was selected for scientific notation.)
Use a Calculator.
6679034adxn ( i did it without a calculator as well)
72 but there is such a thing as a CALCULATOR