Scene 1
T: Numbers are useful. And numbers are interesting too.
Scene 2
T: How many eggs do we have?
S: Twelve.
Scene 3
T: A clock has twelve numbers. We use them to tell the time.
S: And a year has twelve months!
Scene 4
T: In a mobile phone number, how many numbers are there?
S: Twelve?
T: No, eleven.
Scene 5
T: And a football team always has eleven players.
S1: That's not true!
S2: Oh, how so?
Scene 6
S: A player can get a red card!
T: That's true. Then the team only has ten players!