QR Challenge: Two Step Addition and Subtraction Word Problems

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.

---

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. There were 24 sailboats and 25 motor boats in the harbor. 13 boats sailed out to sea. How many boats remained in the harbor?	36
2. Monica's father cooked 20 hamburgers. Kurt's dad cooked 38 hamburgers. 45 hamburgers were eaten. How many hamburgers were left?	13
3. Angela spent the day at the beach. She saw 12 children swimming in the ocean. 15 children were playing in the sand. 20 children were splashing in the wading pool. How many children did Angela see at the beach?	47
4. The movie theater has 95 seats. 51 children and 24 adults went to see the show. How many seats were empty?	20
5. The Happy Habitat had 21 koala bears. They had 15 panda bears. 11 bears were moved to another zoo. How many bears were left?	25
6. Sparky had 28 balls. He buried 10 in the garden and 6 behind the garage. How many balls did Sparky have left?	12
7. Jeff had 58 stickers. He used 16 of them this morning. He gave 10 to his friend Ed. How many stickers did Jeff have then?	32
8. Anne had 65 cents. She found 25 cents on the sidewalk. She bought a bag of chips for 55 cents. How much money did Anne have then?	35
9. Trevor did his math homework for 16 minutes. He did his spelling homework for 12 minutes. He practiced the piano for 15 minutes. How much more time did Trevor spend doing homework?	13
10. Rachel went to the store and bought 35 pink erasers and 12 blue erasers. She gave 8 away to her classmates. How many erasers did Rachel have left?	39

 

---