There are very many possible solutions. One such is: 1, 3, 5, 7, 9 and 75.
36 and 64
0 and 100.
100
5050
103
An example of two numbers which add together to make 100 are 47 and 53.
-99
26
-99
The numbers are 4 and 25
For two rational numbers select any terminating or repeating decimal number which starts with 2.10 and for irrational numbers you require a non-terminating, non-repeating decimal which also starts with 2.10.
This has no answer. Any five odd numbers will always add to an odd number. 100 is even.