QR Challenge: Multi-step Addition and Subtraction

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

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.

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. Question 1. Jerry had a box of 64 crayons. He lost 8 of them, and his little sister broke 3 of them. How many crayons does Jerry have left?	53
2.
3. Question 2. Samantha and Krystal have 20 minutes to walk to school together. It takes them 6 minutes to get to the corner where the library is. It takes them another 7 minutes to get to the fire station. How much longer do they have to get to school without being late?	7
4.
5. Question 3. Robert wants to practice goal kicks for soccer. He decides to have 12 kicks before going home from the park. He takes 5 kicks before taking a break to get a drink of water. He then takes another 4 kicks. How many more kicks does he need to make before he goes home?	11
6.
7. Question 4. Ashley practices shooting hoops for basketball. She wants to make 35 baskets by Wednesday. On Monday she makes 13 baskets. On Tuesday she makes 15 baskets. How many more will she need to make on Wednesday?	7
8.
9. Question 5. Steven is reading a book that has 120 pages. He read 35 pages on Monday night and 40 pages on Tuesday night. How many pages does he have left to read?	45
10.
11. Question 6. John earned $12 on Saturday and $20 on Sunday. How much more does he need to earn to give him the $60 he needs to buy a new hockey stick?	28
12.
13. Question 7. Callie had $42 in her savings. She received $55 for her birthday. Callie bought a new video game for $32. How much money does Callie have in her savings now?	65
14.
15. Question 8. Anna has 21 quarters in her piggy bank. Her grandmother gave her 12 quarters for a good report card. Her dad gave her 20 quarters for doing chores around the house. How many quarters does Anna have now?	53
16.
17. Question 9. Maria invited all of her friends over for a water balloon fight in the backyard. Maria had 36 water balloons. One of her friends brought 12 more water balloons. At the end of the water balloon fight there were 4 balloons that did not pop. How many balloons popped during the water balloon fight?	44
18.
19.
20. Question 10. Craig has a $67. He buys six squirt guns for $12 and five packages of water balloons for $10. How much money did Craig have left?	35
21.
22. Question 11. Matthew and his brother Shawn played swimming-pool-basketball. They wanted to make 50 baskets. Matthew made 25. Shawn made 19. How many more do they need to make to reach their goal?	6
23.
24. Question 12. Lauren and Gina's mother told her daughters they can swim in the pool for 60 minutes. First, they swam laps in the pool for 17 minutes. Then they played water polo for 18 minutes. How much longer can they stay in the pool?	25

Multi-step Addition and Subtraction: QR Challenge

https://www.classtools.net/QR/decode.php?text=Question-1.-Jerry-had-a-box-of-64-crayons.-He-lost-8-of-them,-and-his-little-sister-broke-3-of-them.-How-many-crayons-does-Jerry-have-left?

Question 1 (of 24)