If the sheets are named like that, probably the easiest thing to do would be to loop through all the worksheets converting the name to a decimal number by replacing the "_" with a "." and adding to an array. You can then pass the array to a function to check if it is ordered - Chip Pearson has 1 such function on his website, a simple search "pearson test array sorted" should find that page.
Excuse the brevity, using a tablet so what code is there was typed freehand...
PS: I did try to update this in case you have names like 1_2_1 but the piggin' firewall objected and I lost the edited reply... Post back if that is the case and I'll try again.
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