In each diamond, add the left and right hand numbers together, and subtract this sum from the top number to give the value at the bottom.

In each row of the diagram, the central value equals the sum of the differences between the left hand pair of numbers and the right hand pair of numbers.

The inner digit in each segment equals the sum of the two numbers in the outer part of the opposite segment.

In each row of each grid, multiply the left and right hand numbers together to give a digit value, and write this value in the two centre boxes.

In each H shape, the central number is equal to the difference between the sum of the 3 left hand numbers and the sum of the 3 right hand numbers.