I have no experience with coding, but im stuck with a formula for medical equation where you enter the weight and it calculates how much drugs to give…
12kg gives me 1.2000000000002 which i need to only have 1 decimal place
this is the formula… pageVars.child*0.1

anybody got any help… i have tried round but i get that the formula requires an inversible formula

Where are you doing the binding that an inversible formula is required? Could you instead bind it directly to a page variable and do the ROUNDing somewhere else?