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Mastering Inverse Operations
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Mastering Inverse Operations
🔄 Part 1: Understanding Inverse Operations
1. Which operation is the inverse of addition?
Multiplication
Subtraction
Division
2. If 45 + 28 = 73, which equation can we use to check our answer?
73 - 45 = 28
45 - 28 = 17
73 + 28 = 101
3. Complete the inverse operation pairs:
a) 56 + 39 = 95, so 95 - 39 = _____
b) 124 + 67 = 191, so 191 - _____ = 124
c) 238 + 145 = 383, so _____ - 145 = 238
✅ Part 2: Check Your Work Using Inverse Operations
4. Solve each addition problem, then use subtraction to check your answer:
a) 147 + 256 = _____
Check: _____ - 256 = _____
b) 389 + 124 = _____
Check: _____ - 124 = _____
5. Marcus calculated 234 + 178 = 412. Use inverse operations to check if his answer is correct. Show your working:
6. Circle the correct answers. Which of these can be used to check if 156 + 87 = 243?
243 - 156 = 87
243 - 87 = 156
156 - 87 = 69
243 + 87 = 330
🛒 Part 3: Real-Life Applications
7. Sarah bought items costing $165 and $89. She calculated the total as $254. Use inverse operations to check if she's correct:
8. At the school fête, the Year 3 class raised $347 on Monday and $268 on Tuesday. They think they raised $615 in total. Check their calculation using inverse operations:
9. Explain in your own words why inverse operations are useful for checking our maths work:
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