Numbers to add
5 x 103 - 5 x 102
5 x 104- 5 x 102
5 x 105 - 5 x 102
5x 104 - 5 x 103
5 x 105 - 5 x 10
5 x 106 - 5 x 103
4 x 103 - 3.1 x 102
4.1 x 103 - 3.1 x 102
5 x 10-2 - 5 x 10-3
5 x 102 - 5 x 10-1