how to parse 3 decimal number to one decimal code example

Example 1: how to get number after decimal point

decnm = "0"+str(number-int(number))[1:]
float(decnm)

Example 2: route number to 2 decimal number

var round = (num,numOfDecimal=2)=>{
  const numofdic = Math.pow(10,numOfDecimal)
  return  Math.round(num * numofdic) / numofdic;
}