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Inverse Operations Magic
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Inverse Operations Magic
Use addition and subtraction as inverse operations: they undo each other. Solve each puzzle, and use the opposite operation to check your answer.
Cast an inverse spell
Complete each pair. The second number sentence undoes the first.
1.7 + 5 = . Now undo it: − 5 = 7.
2.13 + 4 = . Write the subtraction sentence that checks your answer: − 4 = 13.
3.____ + 6 = 15. Use subtraction to find the missing number.
4.If 16 − 7 = 9, which addition sentence checks it?
- 9 + 7 = 16
- 9 + 6 = 16
- 16 + 7 = 9
Follow the number trail
Use the number line to help you think about adding and subtracting.
5.Start at 8 and hop forwards 5. Where do you land? Use the opposite hop to get back to 8.
6.A number wizard hops forwards 6 and lands on 14. What number did the wizard start at? Show the subtraction spell you used.
Help at the magic show
Read each problem carefully. Use inverse operations to solve or check.
7.Bodhi has 9 star stickers. She gets some more and now has 16. How many stickers did she get? Write the subtraction sentence that helps you solve it.
8.There are 18 counters on the table. A magician makes 5 disappear. How many remain? Write an addition sentence to check.
9.Amira says, “If 12 + 6 = 18, then 18 − 5 = 12.” Is Amira correct? Write the correct subtraction sentence.
TrueFalse
10.Choose two numbers that add to 20. Write the addition sentence and the subtraction sentence that undoes it.
3 printable pages
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Page 2
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