 Challenge Number represents a weakness or problem that the person has to face in the life. While calculating Challenge numbers, the master numbers (11 and 22) should also be reduced to single digits. The Challenge number is calculated from the date of birth of the person, as shown below:

Find the difference between month digit and day digit. For example, in case of Mother Teresa, 8 – 8 = 0. This is the first challenge number which Mother Teresa should face.

The next step is to find the difference between day digit and year digit. In case of Mother Teresa, it is 8 - 2 = 6. This is the second challenge.

Then find the difference between the first and second challenge numbers. It means, 2 - 0 = 2. This is the third challenge.

The fourth challenge number can be found from the difference between month digit and year digit. It is 8 – 2 = 6. This is her fourth challenge.

When we divide the life of a person into 4 parts, these challenge numbers will influence those 4 stages one by one. In Mother Teresa’s case, the challenge numbers are: 0, 6, 2, 6. The final challenge number is 6 and it is repeated twice. This represents a greater emphasis on 6. This number represents a need to become a humanitarian. There will be inner conflict between personal life and the service to others.