title: How to perform Do Calculation work flow in SharePoint2010 Designer
body: <p>How can I do a simple arithmetic multiplication in sharepoint workflow 2010 for a list? could anyone please provide me a good example?</p>
  
  <p>I have tried to create an a workflow for a list,which I saved and published; but it is giving error while running? I dont know, what is this error and how to find and fix this error?</p>
  
  <p>I have a list named "List_Proj_Calc",  two columns "No.days" and "Hours". I want to multiply this colums values and display to next column "Total Hours"</p>
  
  <p>I have confusion on how to put values on "look up for number" dialog to get this result, somebody please help me.</p>
  
  <p>Steps I followed:</p>
  
  <p>1.Added Do calculation in step1 template.</p>
  
  <p>2.Clicked the calculate item link and opened the Look Up dialog window.</p>
  
  <p>3.Selected the "Data source" as my list name eg: List_Proj_Calc.</p>
  
  <p>4.Selected the "Field From Source" as List field name as "No.days".</p>
  
  <p>5.In find list option I gave field No.days and value I gave some number</p>
  
  <p>6.Next I Selected "Multiplied by" option </p>
  
  <p>7.Selected other look up dialog for multiply.</p>
  
  <p>8.repeated the same steps for data source and Filed name selection</p>
  
  <p>9.Gave list column name "Hours" as filed name to multiply</p>
  
  <p>10.Saved and published.</p>
  
  <p>But error!!!!!!!!!!!</p>