Is there any notation for the undecimal system?

Question

Decimal is 0 1;2;3;4;5;6;7;8;9 10;11;... But undecimal 0 1;2;3;4;5;6;7;8;9;? ?0;?1

TWas this system used by an ancient civilisation ?

(I don't know what to tag)

Answer 1

Make up your own notation. Or as there is only one symbol to add we can call it $TEN$.

so the numbers are:

$1;2;3;4;5;6;7;8;9;TEN$

$10;11;12;13;14;15;16;17;18;19;1TEN$

$20;21.......$

Although any modern mathematician doing this would probably use $A$.

I'm more interested in how the Maori used it practically. I imaging they counted to ten and probably had a place holder that the gave as an actually number and a transition to the next set of ten number (and then a second place holder).... Maybe?

Answer 2

Hexadecimal traditionally uses 'digits' 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F; it looks reasonable to use 0,1,2,3,4,5,6,7,8,9,A for undecimal.