In traditional numerology, when a date number is used in calculations, the number is either the entire number (4-digit year for example) or the reduced number. The reduced number is either the single-digit number it is reduced to or a master number 11, 22, or 33.

The number 10 does show up during the number reduction process when 1981 is reduced.

1981: 1+9+8+1 = 19
19: 1+9 = 10
10: 1+0 = 1

However, numbers within the reduction process are not used in traditional numerology calculations. Only the number 1981 or the number 1 would be used.

Similarly the reduction process on your month and day of birth both result in the number 1.

Thus, in traditional numerology, your birthdate as used in calculations would be 1, 1, and 1 instead of 10, 10, and 10.

What it means is that all of your life period cycle numbers are the number 1. It also means that all of your challenge cycles are the number 0.

With your birth date reduced numbers of 1, 1, and 1, your life path number is calculated as the number 3, a number that represents creative expression (among other things.)