Sum numbers with AutoSum
Let Right PDF Editor do the simple math for you with AutoSum features. You can sum, average, count numbers or locate the maximum/minimum value.
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Click on the cell where you want the calculation result to display (for example, B8).
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Choose Home > Edit and click the Auto Sum sign
or click on the arrow (on the right side or below ) and select Sum from the options. Right PDF Editor automatically enters a formula (B8) to sum the numbers as seen here: click cell B8 and then choose AutoSum > Sum. Then, the formula appears in cell B8.

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Click-drag to select the cells to be summed and press Enter to display the result (6814.16) in cell B8.

Note:
1. There are more functions for your various purposes. Choose Home > Edit and click on the arrow next to AutoSum and select the function you need from the options.
2. To clear cell contents, choose Home > Edit > Clear Contents to make selected cells blank on the worksheet. You can press Ctrl+A and use Clear Contents to delete all contents with just one click.