act one

  • 1. How many toy cars are in that circle?
  • 2. Guess as close as you can.
  • 3. Give an answer you know is too high.
  • 4. Give an answer you know is too low.

act two

  • 5. What information will you need to know to solve the problem?

act three


  • 6. What was the percent error of your answer?
  • 7. How would your estimates have to change to get a more accurate answer?
  • 8. It is estimated that 10,000 different Hot Wheels cars have been produced since 1967. How large of a circle would it take to fit all those cars inside?
  • 9. Take a long piece of string. Draw a circle in chalk outside using that string as its radius. Estimate how many cars would fit inside and then calculate it.
  • 10. How much did it cost?