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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.

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 are the four Arithmetic Binary System Addition, Subtraction, Multiplication and Division 2. Give the rules in Addition binary 1+1=10 3. 1010 + 1111? 11001 4. 101111 + 111000? 1100111 5. 1000111111 + 1110111111? 198 6. 11111111100 + 11100011011? 1234 7. Give the rules in Subraction Binary. 0-1= borrow 1 8. 100010110 - 1111010=? 10011100 9. 101101 - 100111=? 110 10. 1110110 - 1010111=? 11111 11. 1000101 - 101100=? 11001 12. 1010110 - 101010=? 101100 13. 1's Complement Method 110011- 11101=? 10110 14. 1's Complement Method 11011 - 1011=? 10000 15. 1's Complement Method 1101101 - 1110010=? 00101 16. 1's Complement Method 11011101 - 11110000=? 0010011 17. 2's Complement Method 1101101 - 0001110=? 0000101 18. 2's Complement Method 1111001 - 1011100=? 0011101 19. 2's Complement Method 100000 - 111111=? 011111 20. 2's Complement Method 110101010 - 111100001=? 00110111

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