{If your display changed from 0.666666666 to just 0. that means you:

1. did not press the [2ndF] (or you didn't press it hard enough) before you pressed the [.] button.
2. Pressed the red [ON/C] when not instructed to do so.

For this to work, you need to have an answer in display:

Press 2 [÷] [3] [=]

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