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  Larger cuneiform numbers

For computation, the Mesopotamians used what is usually referred to as a
'sexagesimal' (i.e., base-60) system.  Technically, this is a slightly
inaccurate designation as they used only combinations of two symbols
bundled together for writing numbers up to 60
<http://it.stlawu.edu/~dmelvill/mesomath/Numbers.html>.  For writing
numbers greater than 60, they just repeated the symbols in different
columns, just as we do, except that where for us a '1' in the 'tens'
column means 10, for the Babylonians a  in the 'sixties' column meant
60. Each column increased the value of the number by a factor of 60, and
the Babylonians wrote their numbers with the largest values to the left,
just as we do. Here are some examples of cuneiform numbers, their
transliterations and values in our notation.
 
 
Cuneiform 	Transliteration 	Decimal value
	1,15 	75
	1,40 	100
	16,43 	1003
	44,26,40 	160000
	1,24,51,10 	305470

There are a few differences between the way we write our numbers and the
way the Babylonians did.  First, they had no special way to mark an
empty column.  We would write a zero to mark the place, they would often
leave a space, but not always.  For example, it is not always clear if 
should mean '2' or '61', or even '3601'.  In practice, empty columns
don't arise that often in a base-60 system and so this was not such a
problem as you may think.  Later on, in the Neo-Babylonian and Seleucid
times, when astronomers needed to do lots of many-place sexagesimal
computations, they did introduce an empty-column marker.

One of the great advantages of a place-value system is that you can use
the same symbols to make ever larger numbers.  There is no limit to how
large a number you can write down.  Another advantage is that you can
continue writing numbers in places to the right of the units column in
order to denote fractions.  All that distinguishes the number 1234 from
the number 1.234 is the use of a decimal point (or comma in Europe) to
mark where the units come.  Computations with fractions are just the
same as computations with whole numbers.  The Babylonians used the same
idea, except that they did not bother with a decimal point - that
absolute size of a number was 'determined by inspection.'   For example,
the number  could mean 160000, as noted above, but it could also be
1/81, the reciprocal of 81, which is why it was widely used.  In the
early days of deciphering Mesopotamian mathematics, people were puzzled
as to why they would go to the trouble of writing a 160000-times
multiplication table.  The last sexagesimal number given in the table
above, , also has a more useful meaning than 305470.  I leave it to you
to figure out what it is, but the answer is on another page in this site.