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QR Challenge: Subtracting one and two digit numbers using a number line

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. 26-4=22
2. 13-8=11
3. 19-4=16
4. 12-7=5
5. 22-8=18
6. 17-8=11
7. 19-9=10
8. 9-8=1
9. 18-9=9
10. 18-11=7
11. 13-10=3
12. 22-4=18
13. 26-2=24
14. 20-8=12
15. 29-9=20

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q1/15:

26-4=&choe=UTF-8

Question 1 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q2/15:

13-8=&choe=UTF-8

Question 2 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q3/15:

19-4=&choe=UTF-8

Question 3 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q4/15:

12-7=&choe=UTF-8

Question 4 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q5/15:

22-8=&choe=UTF-8

Question 5 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q6/15:

17-8=&choe=UTF-8

Question 6 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q7/15:

19-9=&choe=UTF-8

Question 7 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q8/15:

9-8=&choe=UTF-8

Question 8 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q9/15:

18-9=&choe=UTF-8

Question 9 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q10/15:

18-11=&choe=UTF-8

Question 10 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q11/15:

13-10=&choe=UTF-8

Question 11 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q12/15:

22-4=&choe=UTF-8

Question 12 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q13/15:

26-2=&choe=UTF-8

Question 13 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q14/15:

20-8=&choe=UTF-8

Question 14 (of 15)

 


Subtracting one and two digit numbers using a number line: QR Challenge

https://www.classtools.net/QR/decode.php?text=Subtracting one and two digit numbers using a number line
Q15/15:

29-9=&choe=UTF-8

Question 15 (of 15)