What would this mean? 7 is my favorite number? 7 is the number I'm picking?
Chcę czytać przykłady proszę.
Probably "the number I'm picking", although "my favourite number" seems good as well.
No. "liczba", as Wiktionary says, is "a number" as an abstract entity. So it's what we use in mathematics, it's what we'd use to describe an amount of something, etc.
"numer" is "used to show the rank of something in a list or sequence". So for example, the room number 7. The number you had on the attendance list of your class in school. The number on the back of the footballer's shirt. The number of the house/flat etc. Also a telephone number.
Ah, we make the same distinction in German (liczba = Zahl, numer = Nummer) and Norwegian (tall / nummer).
My number is seven, isn't correct because it would require the use of numer and not liczba?