Logic Masters Deutschland e.V.

Rules.
1.Aroundoku(6x6) uses 4 of the digits 0-9 to be determined by the solver. Place one copy of each digit determined in each Row/Column/Box.
2.The number on the black cells is the result of the non-black cells that`s orthogonally adjacent to it using ONLY one of the mathematical operations(addition, subtraction, multiplication, division).The mathematical operation used is to be determined by the solver.
*With subtraction sums, you must subtract the smaller numbers from the largest number. With division sums, you must divide the largest number by the smaller numbers. Numbers may repeat around a black cell, as long as it is allowed by other rules.
Here is the

Penpa+

link to solve online
Here`s the puzzle: