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QR Challenge: Prime Factorization , GCF, and LCM

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. Is the number Prime or Composite? 233 prime
2. Is the number Prime or Composite? 864 composite
3. Is the number Prime or Composite? 597 composite
4. Is the number Prime or Composite? 1,109 prime
5. Write the prime factorization of the number 75 25x3 5x5x3
6. Write the prime factorization of the number 56 7x8 7x2x4 7x2x2x2
7. Write the prime factorization of the number 810 2x3^4x5
8. Write the prime factorization of the number 1,872 2^4x3^2x13
9. Find the Greatest Common Factor (GCF) of this set of numbers: 64 and 48 16
10. Find the Greatest Common Factor (GCF) of this set of numbers: 72 and 156 12
11. Find the Greatest Common Factor (GCF) of this set of numbers: 45 and 108 9
12. Find the Least Common multiple (LCM) of this set of numbers: 18 and 30 90
13. Find the Least Common multiple (LCM) of this set of numbers: 24 and 40 120
14. Find the Least Common multiple (LCM) of this set of numbers: 12 and 28 84
15. Indicate whether you would use a GCF or LCM to solve and then solve: Kiara has 80 lollipops and 32 Snickers bars. She is filling individual bags for Halloween and would like each bag to contain the same combination of lollipops and Snickers bars. How many bags can she fill if she wishes to have no candy leftover? How many lollipops and snickers bars are in each bag? 16 bags, 5 lollipops and 2 snickers bars.
16. Corey is stacking 10-inch boxes while Dale is stacking 12-inch boxes. They plan to stop when their stacks are the exact same height. At what height will this be? 60 inches

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Is_the_number_Prime_or_Composite?_233

Question 1 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Is_the_number_Prime_or_Composite?_864

Question 2 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Is_the_number_Prime_or_Composite?_597

Question 3 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Is_the_number_Prime_or_Composite?_1,109

Question 4 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Write_the_prime_factorization_of_the_number_75

Question 5 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Write_the_prime_factorization_of_the_number_56

Question 6 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Write_the_prime_factorization_of_the_number_810

Question 7 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Write_the_prime_factorization_of_the_number_1,872

Question 8 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Greatest_Common_Factor_(GCF)_of_this_set_of_numbers:_64_and_48

Question 9 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Greatest_Common_Factor_(GCF)_of_this_set_of_numbers:__72_and_156

Question 10 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Greatest_Common_Factor_(GCF)_of_this_set_of_numbers:_45_and_108

Question 11 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Least_Common_multiple_(LCM)_of_this_set_of_numbers:_18_and_30

Question 12 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Least_Common_multiple_(LCM)_of_this_set_of_numbers:_24_and_40

Question 13 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Find_the_Least_Common_multiple_(LCM)_of_this_set_of_numbers:_12_and_28

Question 14 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Indicate_whether_you_would_use_a_GCF_or_LCM_to_solve_and_then_solve:_Kiara_has_80_lollipops_and_32_Snickers_bars._She_is_filling_individual_bags_for_Halloween_and_would_like_each_bag_to_contain_the_same_combination_of_lollipops_and_Snickers_bars._How_many_bags_can_she_fill_if_she_wishes_to_have_no_candy_leftover?_How_many_lollipops_and_snickers_bars_are_in_each_bag?

Question 15 (of 16)

 


Prime Factorization , GCF, and LCM: QR Challenge

https://www.classtools.net/QR/decode.php?text=Corey_is_stacking_10-inch_boxes_while_Dale_is_stacking_12-inch_boxes._They_plan_to_stop_when_their_stacks_are_the_exact_same_height._At_what_height_will_this_be?

Question 16 (of 16)