Let me check how many of our mathematics enthusiasts here have given a thought to this question. We know that our decimal number system consists of the ten digits, viz., 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. We start our counting with ZERO(0), then we count as following:
ONE, TWO, THREE, FOUR, FIVE, SIX, SEVEN, EIGHT, NINE..
Now the next number is TEN(10). The very peculiar thing about this number is that in our decimal system (i.e., common man's number system) we write this number as a 1 followed by a 0. Then comes ELEVEN(11), written as a 1 followed by a 1, then TWELVE(12) written as a 1 followed by a 2, and so on. Now my question is,why is this so? Instead of writing TEN as 10, we could have written it as 1 followed by two 0's, i.e., as '100', or 0 followed by 1, i.e., as '01' or in any other way. Same argument applies in the case of ELEVEN, TWELVE, and so on. My question may seem to be an idiotic one or a meaningless one, but if you have a mathematical insight, then you will realize that it is indeed a very intriguing one. Try to account for this peculiar way in which our ancestors had designed a number system which has framed the structure of the whole of modern science and technology.