Hi nyteiz,
I believe the formula you are looking for is as follows:
(for this example, the formula would normally reside in cell B1)
=CHOOSE(INT(A1*10)+1,"0-10%","10-20%","20-30%","30-40%","40-50%","50-60%","60-70%","70-80%","80-90%","90-100%"
This requires that A1 be formatted as percentage, preferably with at least 1 decimal place. If formatted with 0 decimals and the number 9.9 was entered into A1, it would show as 10%, but the formula in B1 would (properly) show "0-10%", whereas I expect you want 10% to be classed in the 10-20% range.
You can copy and paste this formula to any location in your worksheet. You will probably want to paste it to the right of your first number (of your set of numbers). Once pasted, change the reference from "A1" to the cell your first number is in. Once you make the change, you can copy the formula for other numbers in your set.
I checked this formula out and confirmed that it works. If for some reason you have difficulty, please let me know.
Regards, ... Dale Watson dwatson@bsi.gov.mb.ca