How to convert Text to Number in Excel?

I copy some number from internet into excel file and it can not do the SUMMation.

This is because the format cell is different. I use conventional way also cannot.

Method 1
Right click format cells and change to number.

Can not work.

Method 2
Convert with Paste Special
Select a blank cell
Choose Edit>Copy
Select the cells that contain the numbers
Choose Edit>Paste Special
Select Add
Click OK
To apply number formatting, choose Format>Cells
On the Number tab, select the appropriate format, then click OK.

Can not work.

Method 3:

1) On the Tools menu, point to Macro, and then click Visual Basic Editor.
2) In the Project window, double-click ThisWorkbook.
3) Copy and paste this code into the code window:

Sub ConvertTextToNumbers()

For Each xCell In Selection
xCell.Value = CDec(xCell.Value)
Next xCell

End Sub

4) Select the column that you want to change.
5) Click run from the macro.

IT WORK Marvellously.