Slide 1: Title
Year 8 Mathematics
Integers: Addition and Subtraction
Includes examples, practice, and quizzes
Slide 2: What are Integers?
Integers are whole numbers and their negatives.
Examples: -3, -2, -1, 0, 1, 2, 3
Slide 3: Number Line
Integers can be represented on a number line.
Right = positive, Left = negative
Slide 4: Opposites
Every integer has an opposite.
Example: Opposite of +5 is -5
Slide 5: Adding Positive Integers
Example: 3 + 4 = 7
Move right on number line
Slide 6: Adding Negative Integers
Example: -3 + (-4) = -7
Move left on number line
Slide 7: Adding Mixed Integers
Example: 5 + (-3) = 2
Subtract absolute values
Slide 8: Subtracting Integers
Rule: a - b = a + (-b)
Example: 5 - 3 = 2
Slide 9: Subtracting Negative Numbers
Example: 5 - (-3) = 5 + 3 = 8
Slide 10: Key Rules Summary
Same signs → Add
Different signs → Subtract
Slide 11: Worked Examples 1
7 + (-2) = 5
-6 + 4 = -2
Slide 12: Worked Examples 2
-5 - 3 = -8
-5 - (-3) = -2
Slide 13: Practice Questions 1
1) 4 + (-6)
2) -3 + (-7)
3) 8 - 5
Slide 14: Practice Questions 2
4) 6 - (-2)
5) -9 + 3
6) -4 - (-6)
Slide 15: Word Problems
Temperature drops from 3°C to -2°C
Find the change
Slide 16: Quiz 1
1) -2 + 5
2) -7 - 2
3) 6 - (-3)
Slide 17: Quiz 2
4) -8 + 8
5) 10 - 12
6) -4 - (-4)
Slide 18: Common Mistakes
Forgetting signs
Confusing subtraction rules
Slide 19: Summary
Integers include positives and negatives
Follow rules carefully
Slide 20: Answers
Practice & Quiz Answers: Teacher to review