🔄 Part 1: Understanding Inverse Operations

1. Circle the correct answer: What does "inverse" mean in mathematics?

The same operation

The opposite operation

A harder operation

A multiplication operation

2. Fill in the blanks: Addition and subtraction are _________ operations because they _________ each other.

3. Complete this inverse operation pair:

If 15 + 8 = 23, then 23 - 8 = _____

➕➖ Part 2: Finding Missing Numbers

4. Use inverse operations to find the missing numbers:

a) 47 + ____ = 85

b) ____ + 29 = 73

c) 92 - ____ = 56

d) ____ - 34 = 48

5. Show your working for question 4a using inverse operations:

6. Sarah had some stickers. She gave away 27 stickers and now has 45 left. How many stickers did she start with?

Write the equation: _____ - 27 = 45

Use inverse operations: 45 + 27 = _____

🎯 Part 3: Checking Your Work

7. Tom calculated 156 + 89 = 245. Check if his answer is correct using subtraction:

8. Which of these calculations can you check using inverse operations? (Check all that apply)

67 + 38 = 105

5 × 8 = 40

84 - 29 = 55

72 ÷ 9 = 8

9. Complete the fact family using inverse operations:

25 + 17 = 42

17 + 25 = ____

42 - 17 = ____

42 - 25 = ____

🧮 Part 4: Problem Solving

10. At the school fair, 247 people entered in the morning. By the end of the day, 583 people had entered in total. How many people entered in the afternoon?

Write an equation with a missing number: 247 + ____ = 583

Use inverse operations to solve: 583 - 247 = ____

11. Match each addition fact with its inverse subtraction fact:

1. 36 + 28 = 64

2. 45 + 39 = 84

3. 52 + 33 = 85

4. 67 + 25 = 92

A. 92 - 25 = 67

B. 85 - 33 = 52

C. 64 - 28 = 36

D. 84 - 39 = 45

12. Create your own word problem that requires using inverse operations to solve:

13. Explain in your own words why inverse operations are useful in mathematics:

Inverse Operations Addition Subtraction

Inverse Operations Addition Subtraction

🔄 Part 1: Understanding Inverse Operations

➕➖ Part 2: Finding Missing Numbers

🎯 Part 3: Checking Your Work

🧮 Part 4: Problem Solving

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