Format a float value with a specified number of decimals?

I've made a small function for formatting an integer or float to have two digits after the decimal point:

function formatTwoDigitFloat(val as dynamic) as string
	if val = invalid then return ""

	formattedVal = Str(((val * 100) + 0.1) / 100)
	return Left(formattedVal, Len(formattedVal) - 1)
end function

print formatTwoDigitFloat(0)
>  0.00
print formatTwoDigitFloat(5)
>  5.00
print formatTwoDigitFloat(10)
>  10.00
print formatTwoDigitFloat(5.6)
>  5.60
print formatTwoDigitFloat(19.6)
>  19.60
print formatTwoDigitFloat(19.99)
>  19.99
print formatTwoDigitFloat(1.99)
>  1.99

Can be modified to support more/less precise output if needed.