This is a good book for preschool lessons on fish and under the sea themes. This book can be incorporated into lessons on the letter Hh for hat or Ff for fish.
A fun activity about the ending to the book would be to have students write or draw their own endings about what they think happened, how they think the big fish got the little hat back, or what happened to the little fish. Talk about the facial expressions of the big fish. What mood does his mouth suggest? How does its mood change from the beginning to the end of the book?
There are many discussions and activities to which this book can lead.
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