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Advance A · Week 2 · Addition & Subtraction Mastery

Day 4 Practice Worksheet — Complements

Finding the complement to 100 and 1000 instantly.

Name
Date
Score

  1. §1Complement to 100

    ⏱ 2 min · 20 problems

    Timed drill — start a 2-minute timer, then solve in order. Goal: finish under time with full accuracy.

    1. 01.Complement of 20 to 100=
    2. 02.Complement of 77 to 100=
    3. 03.Complement of 28 to 100=
    4. 04.Complement of 63 to 100=
    5. 05.Complement of 29 to 100=
    6. 06.Complement of 91 to 100=
    7. 07.Complement of 33 to 100=
    8. 08.Complement of 98 to 100=
    9. 09.Complement of 49 to 100=
    10. 10.Complement of 46 to 100=
    11. 11.Complement of 76 to 100=
    12. 12.Complement of 11 to 100=
    13. 13.Complement of 66 to 100=
    14. 14.Complement of 55 to 100=
    15. 15.Complement of 58 to 100=
    16. 16.Complement of 33 to 100=
    17. 17.Complement of 48 to 100=
    18. 18.Complement of 5 to 100=
    19. 19.Complement of 97 to 100=
    20. 20.Complement of 40 to 100=

  2. §2Complement to 1000

    ⏱ 2 min · 20 problems

    Timed drill — start a 2-minute timer, then solve in order. Goal: finish under time with full accuracy.

    1. 01.Complement of 957 to 1000=
    2. 02.Complement of 331 to 1000=
    3. 03.Complement of 345 to 1000=
    4. 04.Complement of 209 to 1000=
    5. 05.Complement of 741 to 1000=
    6. 06.Complement of 140 to 1000=
    7. 07.Complement of 626 to 1000=
    8. 08.Complement of 20 to 1000=
    9. 09.Complement of 870 to 1000=
    10. 10.Complement of 348 to 1000=
    11. 11.Complement of 467 to 1000=
    12. 12.Complement of 426 to 1000=
    13. 13.Complement of 777 to 1000=
    14. 14.Complement of 521 to 1000=
    15. 15.Complement of 231 to 1000=
    16. 16.Complement of 687 to 1000=
    17. 17.Complement of 891 to 1000=
    18. 18.Complement of 399 to 1000=
    19. 19.Complement of 851 to 1000=
    20. 20.Complement of 613 to 1000=

Answer Key

§1 · Complement to 100

  1. 1.80
  2. 2.23
  3. 3.72
  4. 4.37
  5. 5.71
  6. 6.9
  7. 7.67
  8. 8.2
  9. 9.51
  10. 10.54
  11. 11.24
  12. 12.89
  13. 13.34
  14. 14.45
  15. 15.42
  16. 16.67
  17. 17.52
  18. 18.95
  19. 19.3
  20. 20.60

§2 · Complement to 1000

  1. 1.43
  2. 2.669
  3. 3.655
  4. 4.791
  5. 5.259
  6. 6.860
  7. 7.374
  8. 8.980
  9. 9.130
  10. 10.652
  11. 11.533
  12. 12.574
  13. 13.223
  14. 14.479
  15. 15.769
  16. 16.313
  17. 17.109
  18. 18.601
  19. 19.149
  20. 20.387