Bertie's wonderful ears

Oxford Story tree

'Five times five' said Mrs Lines.Mrs Lines talked Quietly but everyone could hear her voice very well.Everyone in the class wrote something but Bertie did not write anything.Bertie put the end of his pencil in his mouth.'what's  the answer?' he asked himself. He wanted to write the answer but he could not.

Today, I read Bertie's wonderful ears. This book's series is Oxford Story tree.
 Bertie was not good at math. He looks like Prince Cecil. Princes Cecil was very smart but Bertie is not. He  did not like a joke about looking like a prince.
But his funny ear makes him famous. What happened to him ??