Voynich Welsh Numerology

[ReneZ]

Anton, this numerology is basically "modulo 9" arithmetic.

This means that for any number, you figure out what is the "rest" if you divide by 9.

Take the number 48. This is 5*9 + 3, so the "rest" term, when dividing by 9 is 3.

For large numbers, this rest term can be quickly obtained by adding the digits of the number, and if that is greater than 9, just add again and keep on adding. For 48, 4 plus 8 is 12, and then 1 plus 2 is 3.

Such a sum is always in the range 1-9, while the modulo term is 0-8. One just has to understand that 0 and 9
are equivalent.
In this type arithmetic, the order of adding makes no difference.
There are alll sorts of fascinating mathematical theorems about this, but that's outside the scope of this topic.