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Addition and Subtraction Inverses
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Addition and Subtraction Inverses
🔰 Beginners — Understanding the Inverse
1. Which equation is the inverse of 8 + 5 = 13?
8 - 5 = 313 - 5 = 85 + 8 = 13
2. Write the inverse of this sentence as a subtraction sentence:
7 + 6 = 13
✏️ Year 4 — Practice Using Inverses
3. Write the subtraction inverse of 24 + 9 = 33.
4. Find the missing number using the inverse. Show your working:
46 - ? = 29
5. Calculate then check using the inverse:
57 + 18 = _______
6. Fill both blanks and use the inverse to check:
100 - 37 = _______ so 37 + _______ = 100
🏅 Year 5/6 — Challenge Problems
7. Sophie walked 3.5 km and then 2.7 km. Use addition to find the total and then use subtraction (the inverse) to check your answer. Show working:
8. A shop records $68 of sales in the morning and $47 in the afternoon. The till shows $120. Use inverse thinking to decide whether the till is correct. Explain your answer and show working.
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