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Subtraction Using Addition Strategies

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Subtraction Using Addition Strategies

Students working on maths problems

📚 Example: How to Use Addition to Solve Subtraction

Problem: 15 - 8 = ?

Think: What number plus 8 equals 15?

Addition strategy: 8 + ? = 15

Answer: 8 + 7 = 15, so 15 - 8 = 7

🧮 Part 1: Using Addition to Solve Subtraction

1. 12 - 5 = ____

Think: 5 + ____ = 12

2. 20 - 7 = ____

Think: 7 + ____ = 20

3. 16 - 9 = ____

Think: 9 + ____ = 16

4. 25 - 8 = ____

Think: 8 + ____ = 25

5. 14 - 6 = ____

Think: 6 + ____ = 14

✏️ Part 2: Word Problems Using Addition Strategies

6. Sarah had 18 stickers. She gave some to her friend and now has 11 stickers left. How many stickers did she give away?

Write the addition equation: 11 + ____ = 18

7. There were 22 birds in a tree. Some flew away and 15 birds remained. How many birds flew away?

Write the addition equation: _______________

8. Tom scored 30 points in a game. His score was 12 points higher than Jake's score. What was Jake's score?

Write the addition equation: _______________

9. A shop had 45 apples at the start of the day. At the end of the day, there were 17 apples left. How many apples were sold?

Write the addition equation: _______________

10. Explain in your own words: Why does thinking about addition help us solve subtraction problems?

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