Write the ten numbers from 0.1 to 1 on four lines. There is a vertical line on the top and two diagonal lines on the bottom in a figure eight shape. There are 4 numbers on each line.

Fill in 0.1 in the middle, and add 1.9 to each side:

1

0.6

0.2

0.1

0.4 0.3

0.5 0.7

0.9 0.8

Or fill in 0.4 in the middle and add 2.1 to each side:

1

0.6

0.1

0.4

0.3 0.2

0.5 0.7

0.9 0.8

Or fill in 0.7 in the middle, and add 2.3 on each side:

1

0.4

0.2

0.7

0.1 0.3

0.6 0.5

0.9 0.8