The most obvious way to increment a number in Excel is to add a value to it. Start with any value in cell A1, and enter "=A1+1" in cell A2 to increment the starting value by one. Copy the formula ...

SUM is the spreadsheet equivalent of an open invite: it welcomes everything into the total, whether it belongs there or not.

You can add a zero before a number in Google Sheets and Excel using this tutorial. You need to change cell formatting or use function.