Magic Numbers S2

S12

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

The answer is as follows.

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

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