How did mr.keesing punish Anne?

Mr. Keesing was the maths teacher of Anne Frank. He was an old fashioned-person. He did not like much troubles in school. Anne was a talkative student in the class. So he was annoyed with Anne. He gave her several warnings but there was no good result.
Ultimately he assigned Anne, extra homework. It was an essay on “A Chatterbox”. Anne wrote that talking is a student’s trait. She had inherited this quality from her mother, who is more talkative but the teacher was adamant. He assigned two more essays. “An Incorrigible Chatterbox" and “Quack, Quack, Quack, said Mistress Chatterbox”. In fact, Mr. Keesing had intended to play a joke on Anne but Anne wrote the essay in such a way that it became a joke on Mr. Keesing himself. After that, he stopped giving Anne any extra homework. He allowed her to talk in the class. He even started making jokes with the children.