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Activate Backspace/Delete Key to Undo additions
  • {{item}}
  • Total
    {{sum}}

* Type a number and hit Enter to add it
* Type a math expression like 16 * 4 or 56 / 7 and hit Enter to add the result
* Hit Delete / Backspace key to undo the addition
* Click on Delete button to remove any specific item
* Check source code and send issues/sugegstions - Sum It