Tarnese Numbers

Hello,
   Now that I'm on Christmas holidays I have had more time
to conlang.  The first result of this is that I've finally
sat down and typed up the notes I've been slowly compiling
on the Tarnese number system.  I was wondering if you could
tell me what you think.  I've not actually practiced much,
and am not so good at conversions from octal to decimal and
back, so any feedback would be appreciated.  Also, could
anyone suggest a way that I might derive cardinal numbers.
It's been puzzling me and I'm not sure of the best way to
go about doing this.  Happy reading. :)

-----Tarnese Numbers-----

The Tarnese use an octal number system.  The Tarnese don't
have calculators.  Instead they calculate on their version
of an abacus, called a sílemùwd.

Higher numbers are formed by adding a syllable to the lower
number word.  Numbers are written and said from right to
left.  A dash separates every two digits.  This indicates a
slight pause, otherwise the number words become too
unwieldy.  The suffix is added to the last word in a number
only.  Numbers have the natural suffix '-azh' but
mathematical operations have the man-made suffix '-uwd'.
Scholars believe this developed because numbers are a way
to describe things that are quite naturally grouped
together but adding, subtracting, etc. are things that
people do to manipulate numbers.

The numbers are as follows:

Tarnese Words    Tarnese Octal   English Octal   Decimal
sìnazh           0               0               0
telàzh           1               1               1
mendázh          2               2               2
kulázh           3               3               3
pedházh          4               4               4
shilázh          5               5               5
lezázh           6               6               6
tamázh           7               7               7
sìndelázh        01              10              8
tèdelázh         11              11              9
mèndelázh        21              12              10
...
tàndelázh        71              17              15
sìmendázh        02              20              16
teméndazh        12              21              17
meméndazh        22              22              18
...
tadámazh         77              77              63
sizìn-télazh     00,1            100             64
tezìn-télazh     10,1            101             65
...
tadàm-támazh     77,7            777             511
sizìn-sindélazh  00,01           1,000           512
tezìn-sindélazh  10,01           1,001           513
...
silèz-kuménd-talèz-pédhazh   16,32,76,4   4,672,361
1,275,121

A small math vocabulary

to add - shanílew
addition - kazhánùwd
to subtract - longílew
subtraction - kalóngùwd
to multiply - pezílew
multiplication - kabézùwd
to divide - thidílew
division - kadhídùwd
to count - telàmendílew (lit. something like 'to one-two')

I think 'ka-' is the equivalent of '-ion' in English, but
what exactly does adding the suffix '-ion' do to an English
word?
Thank you for any help you might give.
---Etak
P.S.  Could someone please help me find better names for my
noun classes.  They are currently magical, living, natural,
man-made, and unnatural.  I've found myself making notes
about unnatural and man-made endings and it almost sounds
like I'm talking about someone's untimely death. ;)


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