MathematicsFreePrintable

Solving Subtraction Equations

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Solving Subtraction Equations

Mathematical equation with question mark

📝 Instructions

Remember: The unknown (x) represents a number that is zero or positive. It cannot be negative! Think about what makes sense in real life - you can't give away negative apples or remove negative toys.

Strategy: Use the inverse operation (addition) to check your answers. If 12 - x = 7, then 7 + x should equal 12.

🧮 Part 1: Solve These Subtraction Equations

1. 15 - x = 8

x = _____

2. 12 - x = 5

x = _____

3. 20 - x = 13

x = _____

4. 18 - x = 9

x = _____

5. 14 - x = 6

x = _____

6. Maya had 16 stickers. After giving some away, she has 7 left. How many stickers did she give away?

Equation: 16 - x = 7

x = _____

7. There were 13 cookies on a plate. After some were eaten, 4 remained. How many cookies were eaten?

Equation: ________________

Answer: _____ cookies

8. Choose the correct answer for: 17 - x = 10

x = 7

x = 27

x = 10

x = 17

9. Which equation matches this story: "Tom collected 19 shells. He lost some at the beach and now has 12 shells."

19 + x = 12

19 - x = 12

12 - x = 19

x - 19 = 12

10. Solve and explain your thinking: 22 - x = 15

x = _____

Explain how you found your answer:

🌟 Extension Problems (Challenge!)

11. Advanced Challenge: If 35 - x = 18, what is x?
12. Super Challenge: Find both unknowns if a + b = 12 and a - b = 4

Hint: a = _____ and b = _____

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