I’m running into some confusing behavior in an excel spreadsheet. Two columns, which we’ll call A and B. A contains a "time decimal" such as 0.15 or 0.30 (fifteen or thirty minutes). I need to convert this to "normal decimal," such as 0.25 or 0.5. The values from this come from other columns in the table.
Before I can do my conversion, I need to find whether the time should be rounded to the quarter hour. I thought I’d use =MOD() to check whether the "time decimal" * 100 is evenly divisible by 15.
BUT: I’m getting inconsistent results. In Column A I have the "time decimal" and in column B I have the formula:
=MOD(A1*100,15)
In the following screenshot, I would expect it to give 0 in both rows, but it is not:
As far as I can tell, the data in A1 and A2 is identical. All of the four visible cells are of Type "Number."
Is there something going on behind the scenes that I don’t know about? Is there a way I can force the correct behavior?
The likeliest reason is that the first one is not exactly 0.30, but 0.299999 for example. That would make the result of
MOD(xx*100,15)14.99999, which shows as 15.00 if you only show 2 decimals.