Use this worksheet in conjunction with estimation and Goldfish crackers. First, have the students hold a cracker in his/her hand. Next, let the students lay the cracker on the fish. Then, have the students write down his/her best guess of how many fish crackers will fit on the fish. Finally, have the students place fish crackers on the fish and count and write the real number on the page. I have done this activity as a whole class, center activity, or individual activity. Each year my kids love this activity.