Challenge Level

It's useful to recall that we humans use 10 as our source for counting and our columns for writing are Units, Tens, Hundreds, Thousands etc.

Th H T U

So saying 1234 as one Thousand two Hundred and Thirty Four could - more clumsily - be said as

one (ten lots of ten lots of ten) 2 (ten lots of ten) 3 (tens) and 4.

Looking at this practically here we have a heap of red dots and you see how they would be grouped to be counted, firstly in human 10's and then in Senda 6's.