Sorting Decimal Values

Bob often needs to construct tables that are keyed to titles in government regulations. The numbering of the regulations is in decimal form and this creates problems when he tries to sort them in order. Examples are 820.20, 820.25, 820.200, 820.250. Bob enters these as text, but they still come out sorted in a manner that he does not want. In all cases, Excel drops off the trailing zeros and sees "820.20" and "820.200" as the same thing; Bob is wondering what he can do.

First of all, it should be pointed out that if Excel is dropping the trailing zeroes, then the cells are not formatted as text. You'll need to format the cells as text before you put anything in them, or else you'll need to precede the entry with an apostrophe. In either case, the trailing zeroes should remain in place.

Another way to force the entries to text is to modify them in some way. For instance, you could enter "Reg 820.200" instead of "820.200." Or you could replace the period after the 820 with a space or a dash. Any of these methods, and many more, would force the entry to be treated as text.

Even if you force the entry of information to text, that still won't solve the sorting problem, however. Sort a bunch of these cells, and they will still come out in an order you don't want:

820.190
820.2
820.20
820.200
820.201
820.25
820.27

The reason is because the sorting is done from left to right, and in this scheme ".20" will always come before ".200" which always comes before ".25." The only way around this is to modify the structure of the numbers so that (in this case) there are always three digits after the decimal point:

820.002
820.020
820.025
820.027
820.190
820.200
820.201

While this gives the proper sorting order, it does havoc to the original intent: to match the numbering used in the governmental numbering system. If you want to be true to that numbering scheme, the only solution is to use three columns for your numbering. The first column would be the government numbers, entered as text. The second column would be the part those numbers to the left of the decimal point, derived with a formula:

=LEFT(A1,FIND(".",A1)-1)

The third column would be the portion to the right of the decimal point, derived with this formula:

=RIGHT(A1,LEN(A1)-FIND(".",A1))

With the three columns in place, you can then do your sorting based on the contents of the second and third columns. After the numbers are sorted, you can hide the second and third columns, as desired.