Casio fx-82MS Manual Book page 12

7
Mastering the Calculator using the Casio fx-82MS
Example
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The keystrokes are
The display should read 305.
Sometimes you may have a sum like this:
-7 + 4
You can use the key.
The key strokes are
The display should read -3.
You could also use the keystrokes
In this case the calculator recognises the – as a negative (not recommended to do it this way).