copy the data from one cell. Then click on frost destination cell. Hold
down Shift-Cntl and press down arrow. This should highlight all the data.
Then paste the new value using the menu Edit - Paste (or press Cntl - V).
Enter 1.3 in an empty cell
Copy that cell: Edit>Copy
Select the range of cells that you want to increase
Now do: Edit>Paste Special>Multiply>OK
Delete the 1.3