Casio ClassPad 300 PLUS - Manual (Page 629)

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uClassPad Operation
(1) With the stylus, tap the cell where you want the result to appear.
• In this example, we would tap cell A1.
(2) On the [Action] menu, tap [sum].
• This inputs an equal sign and the [sum] function into
the edit box.
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Using the Action Menu
(3) Use the stylus to drag across the range of data
cells from A7 to C12 to select them.
• “A7:C12” appears to the right of the open parenthesis
of the [sum] function.