QR Challenge: Decimals Rounding, Adding and Subtracting Review
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
- Download a QR reader (e.g. I-Nigma | NeoReader | Kaywa) onto their mobile devices
- Bring these devices into the lesson.
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. What is the SUM of 634 and 245.897? | 879.897
|
2. What is the Difference of 45 and 26.782? | 18.218
| 3. Mrs. Tuck and Sam raced in the 100 meter dash. Mrs Tuck finished in 27.27 seconds and Sam finished in 27.34 seconds. Round their times to the nearest tenth. How would Sam feel about the rounded times vs, his real time? | He would like the rounded times since he lost and this would make them tie the race.
| 4. Round to the nearest hundred 4567.34 | 4600
| 5. Round to the nearest thousandth 12.34563 | 12.346
| 6. In October we got 1.45, 3.6, .79 and 1.09 inches of rain. How much rain did we get this month? | 6.93 inches
| 7. Subtract 234 - 123.678 | 110.322
| 8. Add 45.06 + 12.349 | 57.409
| 9. Round to the nearest million 24, 780,980.65 | 25,000,000
| 10. Round to the nearest tenth 12.96 | 13 |
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=What-is-the-SUM-of-634-and-245.897?
Question 1 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=What-is-the-Difference-of-45-and-26.782?
Question 2 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Mrs.-Tuck-and-Sam-raced-in-the-100-meter-dash.--Mrs-Tuck-finished-in-27.27-seconds-and-Sam-finished-in-27.34-seconds.--Round-their-times-to-the-nearest-tenth.--How-would-Sam-feel-about-the-rounded-times-vs,-his-real-time?
Question 3 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Round-to-the-nearest-hundred-4567.34
Question 4 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Round-to-the-nearest-thousandth-12.34563
Question 5 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=In-October-we-got-1.45,-3.6,-.79-and-1.09-inches-of-rain.--How-much-rain-did-we-get-this-month?
Question 6 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Subtract-234---123.678
Question 7 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Add--45.06-+-12.349
Question 8 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Round-to-the-nearest-million-24,-780,980.65
Question 9 (of 10)
Decimals Rounding, Adding and Subtracting Review: QR Challenge
https://www.classtools.net/QR/decode.php?text=Round-to-the-nearest-tenth-12.96
Question 10 (of 10)
