Concatenate a Number with Text but Output is Way to many decimal places

[Tony_Insua]

Hi, I’ve used a concatenate expression to combine a math number and text (the text denotes the units of measure); however, I’m getting a value like this:
3.643724696 UNITS.

What can I do to the formulation so that it’s something like this:

3.64 UNITS

Thanks in advance!
Tony