Detailed Case Study Search the Archive Feedback

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.

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!

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

## Question | ## Answer |

1. What is the common difference in the following sequence? 2, 4, 6, 8, 10 | 2 |

2. Identify the type of sequence: 4, 7, 10, 13, 16 | arithmetic |

3. Identify the type of sequence and the common difference or common ratio: 100, 50, 25, 12.5 | geometric sequence with a common ratio of .5 |

4. Identify the type of sequence and the common difference or common ratio: 100, 20, 4, .8 | geometric sequence with a common ratio of .2 |

5. Identify the type of sequence and the RULE: 10, 8, 16, 14, 28, 26, 52 | This sequence is an "other" sequence, and the rule is +2 x2 |

6. What is the common difference in 27, 25, 23, 21? | -2 |

7. What is the common difference in 3, 6, 9, 12? | 3 |

8. What is the common ratio in 2, 10, 50, 250? | 5 |

9. What is the RULE in the sequence ...300, 150, 75, 37.5...? | The rule is multiply by one-half OR divide by 2. |

10. What is the eighth term in the sequence...3, 7, 11, 15...? | 31 |

11. What is the fifth term in the sequence...500, 200, 80...? | 12.8 |

12. What is the rule in the sequence ...36, 49, 64, 81...? | square the number |

13. What is the common difference in the sequence...16, 20, 24, 28...? | 4 |

14. What is the common difference in the sequence...90, 80, 70, 60...? A) 10 B) -10 C) x 10 D) None of the choice | B)-10 |

15. What is the common ratio in the sequence...3, 12, 48, 576...? A) x4 B) 4 C) 9 D) +9 | B) 4 |

16. What is the common difference in the sequence .2, 3.2, 4.4, 5.6? | 1.2 |

17. What will be the fifth term in the sequence 4.5, 5.1, 5.7? | 6.9 |

18. What will be the fifth term in the sequence 500, 150, 45? | 4.05 |

19. What does common difference mean? | The common difference is what is being ADDED from one term to the next from left to right in an arithmetic sequence. |

20. What is common ratio? | Common ratio is what is being multiplied from term to term from left to right in a geometric sequence. |

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