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QR Challenge: Exponential Word Problems

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. In 1985, there were 285 cell phone subscribers in the small town of Christmanville. The number of subscribers increased by 75% per year after 1985. How many cell phone subscribers were in Christmanville in 1994?43,872 subscribers
2. The foundation of your house has about 1,200 termites. The termites grow at a rate of about 2.4% per day. How long until the number of termites doubles?29-30 days
3. You drink a beverage with 120 mg of caffeine. Each hour, the caffeine in your system decreases by about 12%. How long until you have 10mg of caffeine?19-20 hours
4. An adult takes 400 mg of ibuprofen. Each hour, the amount of ibuprofen in the person’s system decreases by about 29%. How much ibuprofen is left after 6 hours?51.2 mg
5. What is the domain of an exponential function?All real numbers because any real number is a valid input into an exponential function.

 


Exponential Word Problems: QR Challenge

https://www.classtools.net/QR/decode.php?text=In-1985,-there-were-285-cell-phone-subscribers-in-the-small-town-of-Christmanville.-The-number-of-subscribers-increased-by-75%-per-year-after-1985.-How-many-cell-phone-subscribers-were-in-Christmanville-in-1994?

Question 1 (of 5)

 


Exponential Word Problems: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-foundation-of-your-house-has-about-1,200-termites.-The-termites-grow-at-a-rate-of-about-2.4%-per-day.-How-long-until-the-number-of-termites-doubles?

Question 2 (of 5)

 


Exponential Word Problems: QR Challenge

https://www.classtools.net/QR/decode.php?text=You-drink-a-beverage-with-120-mg-of-caffeine.-Each-hour,-the-caffeine-in-your-system-decreases-by-about-12%.-How-long-until-you-have-10mg-of-caffeine?

Question 3 (of 5)

 


Exponential Word Problems: QR Challenge

https://www.classtools.net/QR/decode.php?text=An-adult-takes-400-mg-of-ibuprofen.-Each-hour,-the-amount-of-ibuprofen-in-the-person’s-system-decreases-by-about-29%.-How-much-ibuprofen-is-left-after-6-hours?

Question 4 (of 5)

 


Exponential Word Problems: QR Challenge

https://www.classtools.net/QR/decode.php?text=What-is-the-domain-of-an-exponential-function?

Question 5 (of 5)