merge multiple worksheets into one - excel

Question

I'm trying to merge multiple worksheets into one summary sheet.
Each Worksheet has the name 'Table #number', for example Table 1, Table 2 etc. The layout of each sheet is identical. Data range is columns A1 : N13.
This function doesn't work: =SUM('Table 1':'Table 25'!$A$1:$N$13).
How do I use VBA to amalgamate this data?

Answer 1

Sub MergeSheet()
'Declaring the Variables
Dim LastRow, ShtCnt As Integer
Dim ShtName As String
Dim NewSht As Worksheet
'Assinging a Sheet Name by UserInput
ShtName:
ShtName = InputBox("Enter the Sheet Name you want to create", "Merge Sheet", "Master Sheet")
'Count of Total Worksheet in the present workbook
ShtCnt = Sheets.Count
'Using For Loop check if the worksheet exists
For i = 1 To ShtCnt
If Sheets(i).Name = ShtName Then
MsgBox "Sheet already Exists", , "Merge Sheet"
GoTo ShtName
End If
Next i
'Create a New Sheet
Worksheets.Add.Name = ShtName
'Assigning NewSht as Current Sheet
Set NewSht = ActiveSheet
'Moving Worksheet to the beginning of this workbook
NewSht.Move before:=Worksheets(1)
'Copying all the data to the New Sheet Using For Loop
For i = 2 To ShtCnt + 1
'If i=2 Then copy all the data from the second sheet including header.
If i = 2 Then
Sheets(i).UsedRange.Copy NewSht.Cells(1, 1)
Else
'If i is grater than 2 then copy all the data excluding Header(1st Row).
Sheets(i).UsedRange.Offset(1, 0).Resize(Sheets(i).UsedRange.Rows.Count - 1, Sheets(i).UsedRange.Columns.Count).Copy NewSht.Cells(LastRow + 1, 1)
End If
LastRow = NewSht.Cells.SpecialCells(xlCellTypeLastCell).Row
Next i
'Displaying the Message after copying data successfully
MsgBox "Data has been copied to " & ShtName, , "Merge Sheet"
End Sub

Answer 2

This is a simplified example:
Option Explicit
Sub amalgamateData()
'initialise result variable
Dim myResult As Double
myResult = 0
'loop through sheets to get the sum
Dim wks As Excel.Worksheet 'loop control variable
For Each wks In Excel.ThisWorkbook.Worksheets
If Left(wks.Name, 5) = "Table" Then ' only the "Table" sheets
With wks
Dim rngTarget As Range
myResult = myResult + Excel.Application.WorksheetFunction.Sum(.Range("A1:N13"))
End With
End If
Next
'add result to sheet "Result"
Excel.ThisWorkbook.Sheets("Result").Range("A1") = myResult
End Sub
My starting point was this SO Post: how-to-merge-data-from-multiple-sheets
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