Warm-Up 1
Day 2: Integer Operations
Review adding, subtracting, multiplying, and dividing positive and negative numbers.
Student Goal
I can solve problems with positive and negative numbers.
Why It Matters
Integers help students reason about temperature, money, elevation, scores, and later rational number operations in 7th grade.
Warm-Up
Warm-Up 2
Find -3 x 5.
Warm-Up 3
A temperature drops from 2 degrees by 7 degrees. What is the new temperature?
Short Lesson
Standard Focus
NC.7.NS: The Number System
Student-Friendly Standard Goal
I can use positive and negative numbers to solve problems and explain my thinking.
- Integers include positive numbers, negative numbers, and zero.
- Adding a positive number moves right on a number line. Adding a negative number moves left.
- For multiplication and division, same signs give a positive result. Different signs give a negative result.
Guided Examples
Guided Example 1
Temperature Change
The temperature is -4 degrees in the morning. It rises 9 degrees. What is the new temperature?
Step 1
-4 + 9
Which direction does a rise of 9 move on the number line?
Guided Example 2
Integer Product
A submarine descends 6 meters each minute for 4 minutes. Represent the total change.
Step 1
4 x (-6)
Why is the 6 negative?
Practice
Problem 1
Find -8 + 3.
Problem 2
Find -2 - 6.
Problem 3
Find -7 x -3.
Problem 4
A bank account changes by -12 dollars each day for 3 days. What is the total change?
Problem 5
Which answer is reasonable for -18 / 3?
Reflection
How are you feeling about today's skill?
Optional reflection: Which integer rule or visual helped you most today?