Mystery Jars


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For this activity, the instructor prepares two mystery jars of identical size, one filled with smaller objects, one with larger objects. Students are asked to record their estimates of the number of objects in each jar on the downloadable recording sheet and explain their reasoning. Students are encouraged to understand the difference between guessing and estimating. Suggested discussion questions are included.

Learning Registry Activity


    Topics and Grades

    Grade: TK/K to 6

    Topics: Professional Development, Number Sense, Measurement & Tools, Counting & Place Values, Inquiry & Problem Based Learning, Estimation & Rounding, Area & Volume, Education, Child Development & Family Services, Mathematics

    Resource Pedagogy

    Resource Type/Classification:

    • Teacher Materials

    Tool for: Teachers