Hunting for Averages Rodri

When there is a missing number in a center,you have to add all the numbers outside the center,then divided them by how many numbers are there that surrounding.Now we can find out the answer in the blank.If you found a missing number that not in the center.You have to add the rest numbers outside the square,then divide the number by the number that had been put on the square centre.Now you can find the answer