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QR Challenge: Math Subtraction Challenge

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. 25 – 1114
2. 57 – 2631
3. 84 – 1272
4. 67 – 1552
5. 32 – 1517
6. 59 – 4910
7. There are 97 people staying at a campsite. 36 are adults and the rest are children. How many children at the campsite?61
8. There are 66 rabbits in a pen. One afternoon 38 rabbits escape. How many rabbits left in the pen?28
9. There are 76 guests at a party. 29 are adults and the rest are children. How many children at the party?47
10. Kelvin has 55 marbles and Michelle has 17. How many more marbles than Michelle does Kelvin have?38
11. Pauline is 126cm tall. Janet is 98 cm tall. What is the difference in height between Pauline and Janet?28
12. 29cm is cut from a 50cm pipe. What is the length of pipe that remains?21
13. 100 children started the race, but only 76 finished. How many dropped out?24
14. James had invited 100 friends, but only 69 were coming to his birthday party. How many were not coming?31
15. 1000 - 441559
16. 195 – 14352

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=25_–_11

Question 1 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=57_–_26

Question 2 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=84_–_12

Question 3 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=67_–_15

Question 4 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=32_–_15

Question 5 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=59_–_49

Question 6 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=There_are_97_people_staying_at_a_campsite._36_are_adults_and_the_rest_are_children._How_many_children_at_the_campsite?

Question 7 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=There_are_66_rabbits_in_a_pen._One_afternoon_38_rabbits_escape._How_many_rabbits_left_in_the_pen?

Question 8 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=There_are_76_guests_at_a_party._29_are_adults_and_the_rest_are_children._How_many_children_at_the_party?

Question 9 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=Kelvin_has_55_marbles_and_Michelle_has_17._How_many_more_marbles_than_Michelle_does_Kelvin_have?

Question 10 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=Pauline_is_126cm_tall._Janet_is_98_cm_tall._What_is_the_difference_in_height_between_Pauline_and_Janet?

Question 11 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=29cm_is_cut_from_a_50cm_pipe._What_is_the_length_of_pipe_that_remains?

Question 12 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=100_children_started_the_race,_but_only_76_finished._How_many_dropped_out?

Question 13 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=James_had_invited_100_friends,_but_only_69_were_coming_to_his_birthday_party._How_many_were_not_coming?

Question 14 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=1000_-_441

Question 15 (of 16)

 


Math Subtraction Challenge: QR Challenge

https://www.classtools.net/QR/decode.php?text=195_–_143

Question 16 (of 16)