Special Puzzle S12 Magic Numbers S2

There are spaces for number panels in this two-by-two stone grid.
Place the panels so that adding or multiplaying two numbers horizontally or vertically results in the number shown between the two panels.
Slide the panels to move them and place them in the grid.

Answer for 'Magic Numbers S2'

The answer is as follows.

top-left=8
top-right=6
bottom-left=21
bottom-right=9