Then you can use Math.Round and select the amount of digits. Or do what I said above where you can *10, math.floor, and then /10 or whatever amount of decimals you want.
Once you do the c = "Test" + b; any integer or float will be automatically changed into a string.
Please at least try it out and then if it still isn’t working, show what you want as exact as you can, because the first post looks like you wanted to drop all of the decimal places.