Dear Angel,
Here in the UK, I always advise my Beginner students to use the individual digits, zero to nine. (I use "zero" because "nought" or "ought" is often mispronounced and sounds like "four" or "one". The word "nothing" causes confusion).
Why do I give this advice?
Because, (usually), they know these numbers, --- "One, two, three. etc". There are only 10 of them.
Take the number, 9378. The student must simply say: "nine - three - seven - eight". The other way is to say: "ninety three - seventy eight", which is much more difficult for Beginners. A bigger problem is to say: "nine hundred and thirty seven - eight". In this case, the student must be able to use 1,000 number-phrases.
To speak an eleven-digit telephone number over the phone is an even bigger problem, for the above reason. The student must convert 11304978025 into groups of 1-digit or 2-digit or 3 digit or 4-digit numbers, before he/she speaks. This is a problem, even for native speakers.
In addition, on the telephone, did the Listener hear "thirty" or "thirteen"? Was it "eighty" or"eighteen"? These types of numbers are frequently mispronounced by students, because they put the stress on the incorrect syllable.
Generally speaking, I agree with Libertybelle�s advice.
So, I am not being dogmatic, because different Teachers have different successful methods with different students. But, there is a tendency on the part of some Teachers to say: "I find this easy, so you will find it easy!" Often, this is not so.
Best Wishes in your teaching.
Les
