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Celeste International School

Grade 2 · Worksheet

More addition & subtraction

Complements

Name: ______________________________Date: ______________Score: ______ / 20
  1. 1.

    What is the complement of 35 to make 100?

    1. A55
    2. B65
    3. C75
  2. 2.

    77 + ? = 100. What is the missing number?

  3. 3.

    8 + ? = 100. What is the missing number?

  4. 4.

    530 + ? = 1000. What is the missing number?

  5. 5.

    810 + ? = 1000. What is the missing number?

  6. 6.

    470 + ? = 1000. What is the missing number?

  7. 7.

    340 + ? = 570. What is the missing number?

  8. 8.

    370 + ? = 720. What is the missing number?

  9. 9.

    Calculate mentally: 670 − 380.

  10. 10.

    Calculate mentally: 370 + 290.

  11. 11.

    350 + 750 = 1000.

    True False
  12. 12.

    A complement of 100 is a number you add to another to make 100.

    True False
  13. 13.

    Order these complements of 1000 by the missing number, smallest first.

    Write the order (smallest missing number to largest) in the boxes:

    • ?240 + ? = 1000
    • ?880 + ? = 1000
    • ?510 + ? = 1000
  14. 14.

    36 + ? = 500. What is the missing number?

  15. 15.

    5 + ? = 100. What is the missing number?

  16. 16.

    170 + ? = 4000. What is the missing number?

  17. 17.

    20 + ? = 1000. What is the missing number?

  18. 18.

    20 + ? = 410. What is the missing number?

  19. 19.

    50 + ? = 480. What is the missing number?

  20. 20.

    50 + ? = 500. What is the missing number?

Celeste International School

Answer key

More addition & subtraction — Complements

  1. 1.B. 65
  2. 2.23
  3. 3.92
  4. 4.470
  5. 5.190
  6. 6.530
  7. 7.230
  8. 8.350
  9. 9.290
  10. 10.660
  11. 11.False
  12. 12.True
  13. 13.880 + ? = 1000, 510 + ? = 1000, 240 + ? = 1000
  14. 14.464
  15. 15.95
  16. 16.3830
  17. 17.980
  18. 18.390
  19. 19.430
  20. 20.450