I'd select it as is, and then compose it into an integer.
Here's a recipe I use to round numbers - you'll notice I change the number to a string, then split on the decimal point, and then turn it back into an integer. (You won't need the multiply and divide by 100.)
The value I'm rounding is varMonthlyAmount.
I'm rounding to two decimal places, hence multiply and divide by 100.
div(int(first(split(string(add(mul(variables('varMonthlyAmount'),float(100)),0.5)),'.'))),float(100))