How do I use .2f on Web Storage?

We're trying to save the best score, but it's a float number. When we compile it we get a NaN because the number is too long. How do we save only 2 number after the comma? For actual result and best result?

floor(random(3)+1)

Is an example from my .capx

Random returns a float value but putting floor(value+1) makes it so it rounds down to the nearest whole value.

Or you could try round(x) but I think both of those can only round to the nearest whole number and not any certain decimal place.