text: **USING THE SUM FUNCTION TO ADD**
  
  One of the most used functions is the***SUM***
  function. This function allows you to add the 
  values in a range of cells. The function is written 
  as:**=SUM(range or ranges to add)**. You can  type the function, and then use the pointing 
  technique to fill in the arguments. Excel then paints 
  marquees around the cells involved helping you to 
  track your progress. 