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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 193 · 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. 1.24 − 9 =
  2. 2.64 − 19 =
  3. 3.32 − 29 =
  4. 4.87 − 29 =
  5. 5.56 + 19 =
  6. 6.540 + 99 =
  7. 7.16 + 9 =
  8. 8.69 − 29 =
  9. 9.21 + 19 =
  10. 10.285 + 99 =
  11. 11.70 − 29 =
  12. 12.781 − 99 =
  13. 13.91 − 29 =
  14. 14.23 + 19 =
  15. 15.37 − 9 =
  16. 16.158 − 99 =
  17. 17.53 − 19 =
  18. 18.32 + 29 =
  19. 19.71 + 29 =
  20. 20.19 + 29 =
  21. 21.26 + 9 =
  22. 22.15 + 9 =
  23. 23.64 + 29 =
  24. 24.347 − 99 =
  25. 25.13 − 9 =
  26. 26.87 − 9 =
  27. 27.23 + 9 =
  28. 28.48 + 19 =
  29. 29.59 − 19 =
  30. 30.30 + 29 =
  31. 31.31 + 19 =
  32. 32.37 + 19 =
  33. 33.623 − 99 =
  34. 34.93 − 19 =
  35. 35.27 − 9 =
  36. 36.166 + 99 =
  37. 37.70 − 9 =
  38. 38.80 + 9 =
  39. 39.41 + 29 =
  40. 40.92 − 19 =

Answer key

  1. 15
  2. 45
  3. 3
  4. 58
  5. 75
  6. 639
  7. 25
  8. 40
  9. 40
  10. 384
  11. 41
  12. 682
  13. 62
  14. 42
  15. 28
  16. 59
  17. 34
  18. 61
  19. 100
  20. 48
  21. 35
  22. 24
  23. 93
  24. 248
  25. 4
  26. 78
  27. 32
  28. 67
  29. 40
  30. 59
  31. 50
  32. 56
  33. 524
  34. 74
  35. 18
  36. 265
  37. 61
  38. 89
  39. 70
  40. 73

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