The numbers at the top grid are directly related to the ones at the bottom grid. Take the number in row two at the top and multiply by the number in row one at the bottom and your answer is in row two at the bottom. Hence;
R2 top x R1 bottom = R2 bottom
that is, For the first column,;
2 x 2 = 4
For the second column;
2 x 3 = 6
For the third column;
4 x 5 = 20
For the fourth column;
7 x 6 = 42
For the fifth column;
5 x 5 = 25
For the sixth column;
7 x 8 = 56
Also, R2 top + R1 bottom = R1 top
That means, in the first column, 2 + 2 = 4 and in the second column, 2 + 3 = 5.
Therefore, for the seventh column;
9 x 7 = 63 (and 9 + 7 = 16)
For the eighth column;
1 x 2 = 2 (and 1 + 2 = 3)
For the ninth column;
4 x 3 = 12 (and 4 + 3 = 7)
Therefore the missing numbers in Row1 on top are;
13, 10, 15, 3
The missing numbers in Row2 on top are;
7, 9, 3
The missing numbers in Row1 at the bottom are;
5, 7, 2
The missing numbers in Row2 at the bottom are;
56, 12