Not everyone knows that....for copy-pasting of formulas, text, images, on machines with low RAM, and with worksheet size 50MB and above, it takes quite a long time just for copying. A simple method is this: Click on the MATHCAD 15 Window pull-down menu, and then click on "tile Vertical" the worksheet and the "untitled" one will be tiled. Then select the object in the originary worksheet and drag it to the other "untitled" worksheet.Then click on "Undo" in order to restore the moved object to its original position. The operation is immediate as well as the opposite action that is to past the object copied into another position of the originary file.
I haven't tried it yet with M. PRIME.