# QR Code Review: Integer Operations (Signs Only)

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(649 KB|37 pages)
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NOTE: You will need smartphones, iPads or some other kinds of devices with a QR code reader installed to do this activity. If students are allowed to have their phones in the classroom, you may want to suggest that they install a QR code reader app the night before. I use QR Reader, which is free, but there are many of these types of apps available and most are free.

This activity is quick to set up and gives both you and your students a break from seatwork. Print these mini posters and tape them around your room. Students will check what they think the answer is by using their phone or other smart device and a QR code reader app. This would be a great way to review before a quiz or a test and if you opt to use the reflection sheet, you have a quick way to get feedback on knowledge gaps. I recommend that you give the students the parameters of no more than 3 students per question at a time and set a time limit, such as 10 or 15 minutes to complete the activity.

The focus of these cards is the actual sign you would get, positive or negative, when doing calculations, rather than the calculation themselves. Students identify when the resulting answer would be positive or negative. This means that students do not need calculators for this activity.

The following is found in this activity:

• Same signs with the for basic operations: addition, subtraction, multiplication, and division
• Mixed signs with the for basic operations: addition, subtraction, multiplication, and division
Log in to see state-specific standards (only available in the US).
Apply properties of operations as strategies to multiply and divide rational numbers.
Apply properties of operations as strategies to add and subtract rational numbers.
Recognize opposite signs of numbers as indicating locations on opposite sides of 0 on the number line; recognize that the opposite of the opposite of a number is the number itself, e.g., -(-3) = 3, and that 0 is its own opposite.
Understand that positive and negative numbers are used together to describe quantities having opposite directions or values (e.g., temperature above/below zero, elevation above/below sea level, credits/debits, positive/negative electric charge); use positive and negative numbers to represent quantities in real-world contexts, explaining the meaning of 0 in each situation.
Total Pages
37 pages
Answer Key
Included
Teaching Duration
30 minutes
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