I did not say it was. The numbers are added to get a final sum, in both cases that is 9.
The use of numbers is ancient and some were very clever at it. They could write a message telling one story and at the same time the numerical value gave another hidden story.
This link talks a bit about 9
Number 9 Symbolism, 9 Meaning and Numerology
This is great about 9;
R. Allendy speaks about the curious arithmetical properties of the nine which gives it a very particular character because of the use of our decimal notation system. In another numerical notation system they would cease to exist: the difference between an unspecified number and the number formed by the inversion of its digits is always a multiple of 9 - example: between 26 and 62, the difference is 36, multiple of 9; the multiples of 9 are always composed of digits where the sum (once reduced) is equal to 9; the product 123456789 x 9 gives 9 times the digit 1 in the answer (1111111101). Concerning this last property, Elisabeth Haich mentiones the next calculations:
0 x 9 + 1 = 1
1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
1234 x 9 + 5 = 11111
12345 x 9 + 6 = 111111
123456 x 9 + 7 = 1111111
1234567 x 9 + 8 = 11111111
12345678 x 9 + 9 = 111111111
123456789 x 9 + 10 = 1111111111
Regards Tony