Using SUM() in VBA

Question

If I have a set of cells in a worksheet that I want to add up, I can use the formula:

=SUM(Sheet1!A1:A10)

To do this in a sub, I would use:

Answer 1

I believe the issue with the worksheetfunction.sum is that it needs arguments to evaluate not string. WorksheetFunction.Sum("Sheet1!A1:A3") fails as well. However, this succeeds

Application.WorksheetFunction.Sum(Sheet1.Range("A1"), Sheet2.Range("A1"))

The Ranges could be whatever you like.