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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 544 · 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. 1.56 − 19 =
  2. 2.805 − 99 =
  3. 3.39 − 9 =
  4. 4.27 − 19 =
  5. 5.74 + 19 =
  6. 6.16 − 9 =
  7. 7.64 + 9 =
  8. 8.147 + 99 =
  9. 9.321 − 99 =
  10. 10.766 − 99 =
  11. 11.59 − 29 =
  12. 12.59 + 9 =
  13. 13.37 + 29 =
  14. 14.394 − 99 =
  15. 15.32 − 9 =
  16. 16.25 + 19 =
  17. 17.71 − 19 =
  18. 18.36 − 19 =
  19. 19.49 − 19 =
  20. 20.67 + 29 =
  21. 21.36 − 29 =
  22. 22.40 − 29 =
  23. 23.140 + 99 =
  24. 24.74 − 9 =
  25. 25.18 + 19 =
  26. 26.73 − 29 =
  27. 27.644 − 99 =
  28. 28.163 − 99 =
  29. 29.402 + 99 =
  30. 30.73 + 19 =
  31. 31.68 + 29 =
  32. 32.21 + 9 =
  33. 33.72 − 9 =
  34. 34.495 + 99 =
  35. 35.32 − 19 =
  36. 36.278 + 99 =
  37. 37.63 + 9 =
  38. 38.537 − 99 =
  39. 39.30 − 19 =
  40. 40.62 − 9 =

Answer key

  1. 37
  2. 706
  3. 30
  4. 8
  5. 93
  6. 7
  7. 73
  8. 246
  9. 222
  10. 667
  11. 30
  12. 68
  13. 66
  14. 295
  15. 23
  16. 44
  17. 52
  18. 17
  19. 30
  20. 96
  21. 7
  22. 11
  23. 239
  24. 65
  25. 37
  26. 44
  27. 545
  28. 64
  29. 501
  30. 92
  31. 97
  32. 30
  33. 63
  34. 594
  35. 13
  36. 377
  37. 72
  38. 438
  39. 11
  40. 53

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