Prices Involving Sales Tax: Proper Tipping

A five-question interactive challenges mathematicians to find a correct tip and total amount using percents five, 12, and 18. A tool with moveable pieces assists participants in locating answers. Types of questions include multiple-choice, fill in the blank, and one discussion. 

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CCSS: Adaptable
Additional Tags
Instructional Ideas
  • Direct pupils to answer question five on paper, then discuss their responses as a class 
  • Assign the interactive during math center rotations
  • Send the link for additional practice outside of school  
Classroom Considerations
  • A free CK-12 account is required to access the interactive 
  • The decimal points hang low like a comma
  • Remind pupils to reset the model between questions 
Pros
  • Boosts proficiency in an everyday-life skill 
  • The model is color-coded 
  • Shows correct answers, hints, and additional information when links are clicked 
Cons
  • The model does not include labels for each percentage 
  • Not all prices show the same amount 
Common Core