QR Challenge: Maths Riddles Scavenger Hunt

Created using the ClassTools QR Treasure Hunt Generator

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.

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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!

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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.

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Questions / Answers (teacher reference)

Question	Answer
1. When Michael was 6 years old, his little sister, Lily, was half is age. If Michael is 40 years old today, how old is Lily?	She is 37 years old.
2. Tom was asked to paint the number of plates on 100 apartments which means he will have to paint numbers 1 through 100. Can you figure out the number of times he will have to paint the number 8?2	20 times. (8, 18, 28, 38, 48, 58, 68, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 98)2
3. Leon works at the aquarium. When he tries to put each turtle in its own tank, he has one turtle too many. But if he puts two turtles per tank, he has one tank too many. How many turtles and how many tanks does Leon have?3	He has 3 tanks and 4 turtles.3
4. I am a three-digit number. My second digit is 4 times bigger than the third digit. My first digit is 3 less than my second digit. Who am I?4	141.4
5. Using only addition, how can you add eight 8’s to get the number 1,000?5	888 +88 +8 +8 +8 =1,000.5
6. I am a three-digit number. My tens digit is six more than my ones digit. My hundreds digit is eight less than my tens digit. What number am I?6	193.6
7. A man is twice as old as his little sister. He is also half as old as their dad. Over a period of 50 years, the age of the sister will become half of their dad’s age. What is the age of the man now?7	He is 50 years old.7
8. If you multiply this number by any other number, the answer will always be the same. What number is this?8	Zero.8
9. A little boy goes shopping and purchases 12 tomatoes. On the way home, all but 9 get mushed and ruined. How many tomatoes are left in a good condition?9	Nine.9
10. If four men can build four tables in four hours, how many tables can eight men build in eight hours?10	16 tables.10
11. John, Molly, Joe, Cara and Matthew are all friends. Each of them sends one text message to each other person. How many text messages will be sent in total?11	John will send four text messages: one to Molly, one to Joe, one to Cara and one to Matthew. Molly, who has already received a text message from John, still needs to send four messages - one to each person. This is the same for Joe, Cara and Matthew meaning that a total of 20 text messages will be sent.11
12. The number has three digits. The ones digit is double 4. The hundreds digit is an even number bigger than 5 but smaller than 7. The tens digit is half the ones digit.12	648.12
13. I start with a number. I multiply it by 7. I add 5. I end with the number 54. What number did I start with?13	7.13
14. I start with a number. I divide it by 6. I subtract 4. I end with the number 7. What number did I start with?14	66.14
15. The sides of an equilateral triangle add up to 96cm. What is the length of each side?15	32.15
16. I am a 2D shape. I have five sides. I have five corners. All of my sides are straight. What am I?16	Pentagon.16
17. Add together 1.7litres and 560ml.17	2260ml.17
18. How many vertices does a cube have?18	8.18
19. I’m facing southwest and turn 90 degrees anti-clockwise. Where am I facing?19	South.19
20. Find 2 tenths of 450.20	90.20

 

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