QR Challenge: Adding/Subtracting positive and negative numbers

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

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
Question1 -7 + 8	answer 1
Question2 64 + (-8)	answer2 56
Question3 -6 + (-11)	answer3 -17
Question4 -36 - (-4)	answer4 -32
Question5 50 - (-10)	answer5 60
Question6 -88 - (-11)	answer6 77
Question7 -64 + 22	answer7 42
Question8 40 - (-40)	answer8 0
Question9 -9 - (-80)	answer9 71
Question10 -34 + 40	answer10 6
Question11 -101 - 38	answer11 -63
Question12 7 + (-14)	answer12 -7
Question13 15 - 89	answer13 -74
Question14 -24 + 5	answer14 -19
Question15 18 - 7	answer15 11
Question16 -6 + (-6)	ansswer16 -12
Question17 587 - 890	answer17 -303
Question18 -12 + (-12)	answer18 -24
Question19 0 - 9	answer19 -9
Question20 -70 - (-65)	answer20 -15
Question21 15- (-25)	answer21 35
Question22 -2 - (-7)	answer22 5
Question23 105 + (-7)	answer23 98
Question24 50 + 4	answer24 54
Question25 -830 + 450	answer25 -683
Question26 -23 - 3	answer26 -20
Question27 -3 + (-8)	answer27 -11
Question28 -6 + 18	answer28 12
Question29 -7 - (-70)	answer29 63
Question30 603 + -50	answer30 553
BonusQuestion1 -4 + (-20) - 9 + (-11)	answerbonus1 -44
BonusQuestion2 -731 + (-500)- (-200) + (-444)	answerbonus2 -1475