T: Hello, children.

  Ps: Hello, Miss White.

  T: Today Jiamin’s mother gives him twenty-five sweets. In the morning, Jiamin eats three. And he gives nine sweets to his friends. Children, how many sweets does Jiamin get? What is three and nine? (write down 3+9= on the blackboard)

  P1: It’s twelve. Three and nine is twelve.

  T: You’re so smart(聪明). Good, good, very good. Sit down. It’s twelve. (write down 12 after =) Boys and girls.

  Ps: Yes?

  T: So how many sweets are left. What is twenty- five minus twelve? (write down 25-12= on the blackboard)

  P2: Miss White, I think there are eleven.

  P3: I don’t think so. Twenty-five minus twelve is thirteen.

  T: Children, is he right?     Ps: Yes.

  T: You’re right. Twenty-five minus twelve is thirteen (write down 13 after =).