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December 2001, Volume 8, Issue 4


How Many Marbles in the Jar? Estimation in the Early Grades
Jennifer Taylor-Cox
This article examines methods and types of estimation; and characterizes fruitful in-class estimation tasks by exploring the validity and possible extensions of "marble jar" estimation.

Second Graders Circumvent Addition and Subtraction Difficulties
Joy Whitenack, Nancy Knipping, Sue Novinger, Gail Underwood
How a second-grade class learned to subtract effectively by packing and unpacking "Aunt Mary's candies."

Culture in the Curriculum: Enriching Numeration and Number Operations
Carla Moldavan
A multicultural enrichment project for fourth graders that highlights the number systems and computation algorithms of various cultures. Students' responses and reactions are discussed.