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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 586 · 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. 1.25 + 29 =
  2. 2.139 + 99 =
  3. 3.33 + 29 =
  4. 4.37 + 29 =
  5. 5.86 − 9 =
  6. 6.78 − 9 =
  7. 7.48 + 29 =
  8. 8.81 − 29 =
  9. 9.52 + 19 =
  10. 10.96 − 19 =
  11. 11.62 − 19 =
  12. 12.26 + 19 =
  13. 13.52 − 29 =
  14. 14.771 − 99 =
  15. 15.271 − 99 =
  16. 16.506 + 99 =
  17. 17.61 − 29 =
  18. 18.26 + 29 =
  19. 19.76 − 19 =
  20. 20.553 − 99 =
  21. 21.39 + 9 =
  22. 22.443 + 99 =
  23. 23.15 + 29 =
  24. 24.55 − 9 =
  25. 25.58 + 29 =
  26. 26.61 − 19 =
  27. 27.29 + 29 =
  28. 28.84 − 19 =
  29. 29.35 − 9 =
  30. 30.13 − 9 =
  31. 31.36 + 19 =
  32. 32.52 − 9 =
  33. 33.94 − 29 =
  34. 34.64 − 9 =
  35. 35.51 − 9 =
  36. 36.189 − 99 =
  37. 37.15 + 9 =
  38. 38.70 + 9 =
  39. 39.764 + 99 =
  40. 40.355 + 99 =

Answer key

  1. 54
  2. 238
  3. 62
  4. 66
  5. 77
  6. 69
  7. 77
  8. 52
  9. 71
  10. 77
  11. 43
  12. 45
  13. 23
  14. 672
  15. 172
  16. 605
  17. 32
  18. 55
  19. 57
  20. 454
  21. 48
  22. 542
  23. 44
  24. 46
  25. 87
  26. 42
  27. 58
  28. 65
  29. 26
  30. 4
  31. 55
  32. 43
  33. 65
  34. 55
  35. 42
  36. 90
  37. 24
  38. 79
  39. 863
  40. 454

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