How to use e on the Casio fx-300 Calculator - YouTube
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Natural Logarithm e on Casio fx-991EX Classwiz - YouTube
Casio Classwiz fx-991EX - Storing and Recalling Values | Casio Calculator Store Function fx-570EX - YouTube
Interesting fact: The power on button on Casio's higher end calculators are half pressed by default so you don't accidentally clear the screen by pressing the 'on' button. (I thought it's a
How to set time on Casio CA-506 / 437
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