There are many threads on this issue, here are some examples
>>> bin(100)
'0b1100100'
>>> bin(4)
'0b100'
>>> getBin = lambda x, n: x >= 0 and str(bin(x))[2:].zfill(n) or "-" + str(bin(x))[3:].zfill
>>> getBin(4,8)
'00000100'
you can right click on the field name, click Properties, then press the ... next to Numeric and finally "rounding". You will then be able to format your number as you wish (well, it will be 2.61).
EDIT:
Just to make things clear, my initial answer is for visual rounding because field calculator was not mentioned in the question (I've added the tag). Now I have a few remarks.
Note that if you store your values in float, the "permanent" rounding may leave you with something like 5.599999999999996 (see here) because of the precision of the storage. So you might still want some "visual" rounding for display.
The second thing, as I mentioned, is that the rounding will bring you to the closest rounded value, but you seem to be looking for the floor. To solution would then be
math.floor(!fieldname!*100)/100 # 2.60855654 --> 2.60
Finally, if you want rounded values in a field, I recommand you to manage your field in order to store a given level of precision. When you add your new field, you can set the "precision" to the number of significant digit (in your case 5), and the "scale" to the number of decimal digits (in your case, 2). The rounding will then be automatic.
Best Answer
Is a whole number.
You want to use:
Decimal number (real)Also as mentioned by Joseph in the comments make sure you have a precision set. So precision is how many decimal places get saves and width is the overall number if digits stored both before and after the decimal place.