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True Equation Thinking

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True Equation Thinking worksheet preview

True Equation Thinking

Detective with magnifying glass examining equations

🕵️ Part 1: Equation Detective - True or False?

WALT: Use relational thinking to determine if addition and subtraction equations are true or false.

Instructions: Look at each equation carefully. Circle True or False, then explain your thinking. You can use mental maths, draw pictures, or use counters to help you!

Example: 8 + 7 = 15     True / False
This is TRUE because 8 + 7 makes 15. I can check by doing 15 - 7 = 8.

1. 25 + 30 = 55

True

False

Explain your thinking: ________________________________

2. 40 - 15 = 20

True

False

Explain your thinking: ________________________________

3. 18 + 6 = 24

True

False

Explain your thinking: ________________________________

4. 50 - 23 = 37

True

False

Explain your thinking: ________________________________

🧠 Part 2: Relational Thinking Challenge

Instructions: Use what you know about equivalent number sentences to solve these problems. Remember: if 12 + 8 = 20, then 20 - 8 = 12!

5. If 16 + 9 = 25 is true, then 25 - 9 = ____

16

17

15

6. 32 + 18 = 49

True

False

Show your working using a related subtraction:

7. 63 - 27 = 36

True

False

Check your answer by writing the related addition:

____ + ____ = ____

⭐ Extension Challenge

8. Create your own TRUE equation using addition:

____ + ____ = ____

9. Now write the equivalent subtraction equation:

____ - ____ = ____

10. Challenge: Is this equation true or false? 45 + 17 - 12 = 50

True

False

Show your working:

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