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Adding 9, 19 and 99 Mental Maths Worksheet

Mental maths lesson 4: Add and take away 9, 19 and 99 · Set 415 · 40 questions
TalentJR

How to do it in your head (Round and adjust): Add 9, 19, 99: add 10, 20, 100, then take 1 away. Take away 9, 19, 99: take away 10, 20, 100, then add 1 back. Ask yourself: did I use too much or too little?

NameDateTime takenScore ___ / 40
  1. 1.80 − 29 =
  2. 2.35 + 9 =
  3. 3.789 + 99 =
  4. 4.33 − 29 =
  5. 5.33 + 9 =
  6. 6.20 + 9 =
  7. 7.77 − 9 =
  8. 8.12 − 9 =
  9. 9.244 + 99 =
  10. 10.60 − 9 =
  11. 11.26 − 19 =
  12. 12.95 − 29 =
  13. 13.75 − 9 =
  14. 14.471 + 99 =
  15. 15.12 + 29 =
  16. 16.49 + 29 =
  17. 17.637 + 99 =
  18. 18.94 − 19 =
  19. 19.83 − 29 =
  20. 20.31 − 9 =
  21. 21.641 − 99 =
  22. 22.72 + 29 =
  23. 23.15 + 29 =
  24. 24.20 + 29 =
  25. 25.81 − 19 =
  26. 26.24 + 29 =
  27. 27.467 − 99 =
  28. 28.58 + 19 =
  29. 29.293 + 99 =
  30. 30.37 − 19 =
  31. 31.37 + 19 =
  32. 32.64 + 9 =
  33. 33.80 − 19 =
  34. 34.48 − 9 =
  35. 35.33 + 19 =
  36. 36.36 + 19 =
  37. 37.37 − 29 =
  38. 38.35 + 29 =
  39. 39.68 + 29 =
  40. 40.61 + 9 =

Answer key

  1. 51
  2. 44
  3. 888
  4. 4
  5. 42
  6. 29
  7. 68
  8. 3
  9. 343
  10. 51
  11. 7
  12. 66
  13. 66
  14. 570
  15. 41
  16. 78
  17. 736
  18. 75
  19. 54
  20. 22
  21. 542
  22. 101
  23. 44
  24. 49
  25. 62
  26. 53
  27. 368
  28. 77
  29. 392
  30. 18
  31. 56
  32. 73
  33. 61
  34. 39
  35. 52
  36. 55
  37. 8
  38. 64
  39. 97
  40. 70

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