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Subtraction Reversibility Strategies
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Subtraction Reversibility Strategies
At a wildlife sanctuary, the team tracks supplies and animal-care resources. Solve each subtraction problem, then use addition to check: difference + amount taken away = starting amount. Show your thinking where space is provided.
Use addition to check
Find each difference. Then complete the related addition check.
1.The sanctuary has 423 packets of seed. The team uses 58 packets. How many remain? Check by writing the missing number: ___ + 58 = 423.
2.Arjun works out 512 − 67 by counting up from 67 to 512. What is the difference? Show the addition equation that proves your answer.
3.Choose the correct check for 684 − 29 = 655.
- 655 + 29 = 684
- 684 + 29 = 655
- 655 − 29 = 684
- 29 + 684 = 655
4.The sanctuary has 731 rolls of bandage. After 46 rolls are used, how many are left? Complete both parts: 731 − 46 = and + 46 = 731.
Choose a strategy
You can subtract in parts, count up, or use a written method. Addition checks whether your difference is correct.
5.Rawiri counts 642 bottles of cleaning solution before a delivery. The team uses 357 bottles. Find how many remain and check your answer with addition.
6.A volunteer says that 815 − 468 = 357 because 357 + 468 = 815. Is the volunteer correct? Explain what the addition check shows.
7.The sanctuary records 2,346 kilograms of feed in storage. It uses 789 kilograms. How much remains? Write a matching addition equation to check.
8.A rescue team starts with 4,123 metres of protective netting and uses 1,256 metres. Calculate how much is left, then check by addition.
9.Explain why addition can check a subtraction answer. Use a subtraction example from this worksheet and show its matching addition equation.
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