Finding Cube Root without Scientific caluclator

There was  a Question raised by a student as to how to find Cube Root without the help of Scientific calculator

I have mailed to Mr Pattabiraman (author MAFA) and i am sharing it for the benefit of all students.Please do book mark if you find it necessary

Step1: Take the number and tap( Press)  square root 15 Times

Step2: Deduct 1

Step3: Divide by 3

Step4: Add 1

STEP 5: Tap(ie Press) Multiply* and =(equal to) 15 times