Content Area: Math

 

Index: 4.2D Grade 8 CPI 5

 

Standard: 4.2 - Geometry and Measurement

 

Strand: D - Units of Measurement

 

Cumulative Progress Indicator: 5 - The student will recognize that all measurements of continuous quantities are approximations.

 

Grade: 8

 

Sample Activities:

 

·        Students measure a given hallway in school and compare their results, noting that their results are different because any measurement is approximate. They discuss how accurate their individual measurements are (degree of precision) and, after reviewing all of their measurements, determine the likely errors in their individual measurements. They also discuss how more precise measures may be obtained and what degree of precision is needed in this situation.

 

·        Each student in a group measures the circumferences and diameters of several round objects using a tape measure or ruler and string. They compare their measurements and decide what the most accurate set of measurements is for each of the objects. They use a calculator to find the ratio of the circumference to the diameter for each object.