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QR Challenge: Adding and Subtracting Decimals

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. This year, Shawn ran a race in 18.93 minutes. His time has decreased 4.2 minutes since last year. What was his time last year?23.13
2. The new PS4 costs $399.55. If the cost decreases by 49.99 next year, how much will it cost after the decrease?349.56
3. Bubble tape is now 4.35 feet long. That length has decreased .084 feet since last year. How long was bubble tape last year?4.434
4. The new movie, “The Hunger Games: Catching Fire,” is 3.23 hours long. That is an increase of .54 hours from the length of the first “Hunger Games” movie. How long was the first movie?2.69
5. The new movie, “The Hobbit: The Desolation of Smaug,” is 123.87 minutes long. That is a decrease of 54.78 minutes from the first movie, “The Hobbit: An Unexpected Journey.” How long was “The Hobbit: An Unexpected Journey?”178.65
6. Diego buys a cell phone with 64 gigabytes of data. He adds 32.5 gigabytes of music to his phone. How many gigabytes does Diego have left?31.5
7. The distance from Raleigh, NC to Detroit, MI is 511.57 miles. Cleveland, OH is 429.146 miles from Raleigh. How much farther is Detroit than Cleveland from Raleigh?82.424
8. The mass of a papaya is 1.7 kg. A watermelon is 2.89 kg heavier than the papaya. What is the mass of the watermelon?4.59
9. Donovan went hiking in Durant State Park. He hiked 2.97 miles before taking a break. After resting, he walked another 2.386 miles. How many miles did Donovan hike altogether?5.356
10. Kendra had a $50 gift card to spend at a local electronics store. She went there and spent $37.81 on a variety of items. How much is left on the gift card?12.19
11. Aliyah earned $85.50 for babysitting last week and $21 for mowing yards. She spent $38.74 at the mall. How much money does she still have?67.76
12. Alex set a goal to run 18 miles this week. On Monday he ran 4.08 miles. On Tuesday he ran 3.8 miles. How many miles does Alex need to run to reach his goal?10.12

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=This-year,-Shawn-ran-a-race-in-18.93-minutes.-His-time-has-decreased-4.2-minutes-since-last-year.-What-was-his-time-last-year?

Question 1 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-new-PS4-costs-$399.55.-If-the-cost-decreases-by-49.99-next-year,-how-much-will-it-cost-after-the-decrease?

Question 2 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Bubble-tape-is-now-4.35-feet-long.-That-length-has-decreased-.084-feet-since-last-year.-How-long-was-bubble-tape-last-year?

Question 3 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-new-movie,-“The-Hunger-Games:-Catching-Fire,”-is-3.23-hours-long.-That-is-an-increase-of-.54-hours-from-the-length-of-the-first-“Hunger-Games”-movie.-How-long-was-the-first-movie?

Question 4 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-new-movie,-“The-Hobbit:-The-Desolation-of-Smaug,”-is-123.87-minutes-long.-That-is-a-decrease-of-54.78-minutes-from-the-first-movie,-“The-Hobbit:-An-Unexpected-Journey.”-How-long-was-“The-Hobbit:-An-Unexpected-Journey?”

Question 5 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Diego-buys-a-cell-phone-with-64-gigabytes-of-data.-He-adds-32.5-gigabytes-of-music-to-his-phone.-How-many-gigabytes-does-Diego-have-left?

Question 6 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-distance-from-Raleigh,-NC-to-Detroit,-MI-is-511.57-miles.-Cleveland,-OH-is-429.146-miles-from-Raleigh.-How-much-farther-is-Detroit-than-Cleveland-from-Raleigh?

Question 7 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=The-mass-of-a-papaya-is-1.7-kg.-A-watermelon-is-2.89-kg-heavier-than-the-papaya.-What-is-the-mass-of-the-watermelon?

Question 8 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Donovan-went-hiking-in-Durant-State-Park.-He-hiked-2.97-miles-before-taking-a-break.-After-resting,-he-walked-another-2.386-miles.-How-many-miles-did-Donovan-hike-altogether?

Question 9 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Kendra-had-a-$50-gift-card-to-spend-at-a-local-electronics-store.-She-went-there-and-spent-$37.81-on-a-variety-of-items.-How-much-is-left-on-the-gift-card?

Question 10 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Aliyah-earned-$85.50-for-babysitting-last-week-and-$21-for-mowing-yards.-She-spent-$38.74-at-the-mall.-How-much-money-does-she-still-have?

Question 11 (of 12)

 


Adding and Subtracting Decimals: QR Challenge

https://www.classtools.net/QR/decode.php?text=Alex-set-a-goal-to-run-18-miles-this-week.--On-Monday-he-ran-4.08-miles.--On-Tuesday-he-ran-3.8-miles.--How-many-miles-does-Alex-need-to-run-to-reach-his-goal?

Question 12 (of 12)