complete a pattern there 10 squares four rolls on bottom 4 squares left to right numbers in each square 7 5 3 5 second roll 3 squares numbers 12 8 8 next roll on top of that 2 squares number 20 16 on top one square what number belongs in this block to complete the pattern?

The number in the top square should be 36. Note that a number in a square from the third or the second row is the sum of the numbers taken from squares 'supporting' it. For example, the third row of numbers is formed as follows: 12 = 7 + 5, 8 = 5 + 3, 8 = 3 + 5. Finally, 20 + 16 = 36.