Assessment

Rolling Coins

Curated and Reviewed by Lesson Planet

What caused the extra rotation? Class members visualize a coin rolling around the circumference of another coin. They determine the reason the rolling coin rotates twice. Further questions require them to determine a generalized formula to find the number of rotations based upon the size of the stationary coin.

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Additional Tags
Instructional Ideas
  • Demonstrate rolling the coins to the entire class and ask individuals to explain
  • Have pupils work in pairs with their own set of two coins and then explain to the class how they arrived at their solutions
Classroom Considerations
  • It is beneficial if the class knows how to work with circumferences and rotations about a point
Pros
  • Question includes a picture to help visualize the orientation of the coins
  • Answer key provides a detailed explanation of the correct solution
Cons
  • None