Dave's down-to-earth rock shop
By: by Stuart Murphy ; illustrated by Cat Bowman Smith.
Contributors: Smith, Cat Bowman, ill.
Series: MathStart
Publisher: HarperCollins
Published: 2000
Place of publication: New York, NY
Language: eng
Number of pages: 33
Subjects: Set theory -- Juvenile literature; Set theory
Description: As they consider sorting their rock collection by color, size, type, and hardness, Josh and Amy learn that the same objects can be organized in many different ways.
Notes: "Classifying; Level 3."