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Math 2 · Unit 10: Calculating · Cambridge Primary Maths Stage 2

10.2 Connecting addition and subtraction

16 questions · e.g. 7 + 3 = 10. Which is an inverse calculation?

Practice

Questions

  1. 1. 7 + 3 = 10. Which is an inverse calculation?

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  2. 2. 19 − 12 = 7. Which is an inverse calculation?

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  3. 3. Which is NOT in the fact family of 4 + 3 = 7?

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  4. 4. 13 + 5 = 18. So 18 − 5 = ?

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  5. 5. 32 + 17 = 49. So 49 − 17 = ?

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  6. 6. 50 + 40 = 90. Which subtraction is in the same fact family?

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  7. 7. Why does 30 + 30 = 60 have only 2 facts in its fact family?

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  8. 8. What is the missing digit? 3? + 24 = 59

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  9. 9. Estimate 54 + 35 by rounding to the nearest 10.

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  10. 10. 77 − 44 = 33. Which addition checks it?

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  11. 11. Write two different additions with a total of 20. Which pair works?

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  12. 12. Marcus estimated 40 + 30 = 70. His exact answer is 74. Which could his addition be?

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  13. 13. 8 − 6 = 2. Which is in the same fact family?

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  14. 14. 28 − 15 = 13. So 13 + 15 = ?

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  15. 15. _ + 23 = 59. What is the missing number?

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  16. 16. How many facts are in the fact family for 13, 15 and 28?

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