"Juvenile literature." . . "Science & Nature - Experiments & Projects." . . "Children's 4-8 - Mathematics." . . "Measurement." . . . "Introduces the concept of weight, how and why things are measured and the units of measurement used. Includes simple activities. Suggested level: junior, primary." . . . . . . . . . . . . . . . "Dime cuánto pesa?" . . . . . . "Tell me how much it weighs" . . . . "Introduces the concept of weight, discussing units of weight, methods of measuring weight, and the importance of weight measurement for a variety of uses." . . . . "Juvenile works" . . . . "Physics." . . "Mathematics - Systems of Measurement." . . "Science & Nature - General." . . "Children: Grades 2-3." . . "Weight (Physics)" . . "Juvenile Nonfiction." . . . . "Weights and measures." . .