Rounding with Pi

Math Content: Rounding, Estimation and Number Sense
Instructional Strategy: Student Presentations

Students in Ms. England's class showed a strong ability to both understand the procedure as well as carry it out accurately, yet they all got different answers. Not wrong answers, just different answers. In fact, all of the reporting groups got the "correct" answer, depending on how and when they rounded off the numbers. Some students rounded off early in the problem (using 3.14 for pi), while others kept all of the decimals that their calculator would hold until the very end. Ms. Enlgand was able to use this opportunity to discuss the effects of rounding with her class.

Watch the clip below to see how her students report out their answers.