Note that 12 + 1 =

Draw one line between 10:30 and 2:30, so the region above it contains the numbers 11, 12, 1, 2.

Draw the other line between 8:30 and 4:30, so the region below it contains the numbers 5, 6, 7, 8.

The middle region will contain the numbers 3, 4, 9, 10.

The sum in each of the 3 regions is 26.

**13**, 11 + 2 =**13**, 10 + 3 =**13**and so on. The division must take advantage of this symmetry.Draw one line between 10:30 and 2:30, so the region above it contains the numbers 11, 12, 1, 2.

Draw the other line between 8:30 and 4:30, so the region below it contains the numbers 5, 6, 7, 8.

The middle region will contain the numbers 3, 4, 9, 10.

The sum in each of the 3 regions is 26.