Students use Venn diagrams to explore the multiple sets to which particular number belong. A similar question is used on their test. Students explore the property of closure for a variety of sets of numbers under various operations. Students explore the properties of odd and even numbers under various operations. Students create a book about zero for second-graders.
Students explore the concepts of place value and zero by learning about other number systems.
For example, they might use the computer program Maya Math to learn about the Mayan number system. References Clement, Rod. Counting on Frank . Gareth Stevens Publishing, 1991. The Phantom Tollbooth.