ABSTRACT
Few engineers are ever taught that we use numbers for three quite different purposes: 1. Numbers can be used as names e.g. in
‘Boeing 747’, ‘Number 47 Bus’
2. ’Integers’ are for counting, e.g. the number of people in a room.They are exact, whole numbers
3. ’Real numbers’ are measurements, etc., which are never completely accurate – people have calculated π to billions of places, and still haven’t got to the end.
