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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 395 · 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. 1.53 − 19 =
  2. 2.69 + 9 =
  3. 3.54 − 19 =
  4. 4.30 + 9 =
  5. 5.12 + 19 =
  6. 6.30 + 29 =
  7. 7.64 + 19 =
  8. 8.17 + 9 =
  9. 9.13 + 9 =
  10. 10.67 + 9 =
  11. 11.342 + 99 =
  12. 12.40 + 9 =
  13. 13.815 − 99 =
  14. 14.39 − 9 =
  15. 15.62 − 9 =
  16. 16.66 + 29 =
  17. 17.256 − 99 =
  18. 18.590 − 99 =
  19. 19.29 − 9 =
  20. 20.229 − 99 =
  21. 21.40 + 29 =
  22. 22.636 − 99 =
  23. 23.299 + 99 =
  24. 24.60 + 29 =
  25. 25.21 − 9 =
  26. 26.69 − 9 =
  27. 27.21 + 29 =
  28. 28.581 − 99 =
  29. 29.28 + 19 =
  30. 30.75 + 19 =
  31. 31.735 − 99 =
  32. 32.25 + 9 =
  33. 33.28 + 29 =
  34. 34.72 − 29 =
  35. 35.83 − 9 =
  36. 36.56 + 19 =
  37. 37.227 + 99 =
  38. 38.36 − 9 =
  39. 39.42 + 9 =
  40. 40.102 − 29 =

Answer key

  1. 34
  2. 78
  3. 35
  4. 39
  5. 31
  6. 59
  7. 83
  8. 26
  9. 22
  10. 76
  11. 441
  12. 49
  13. 716
  14. 30
  15. 53
  16. 95
  17. 157
  18. 491
  19. 20
  20. 130
  21. 69
  22. 537
  23. 398
  24. 89
  25. 12
  26. 60
  27. 50
  28. 482
  29. 47
  30. 94
  31. 636
  32. 34
  33. 57
  34. 43
  35. 74
  36. 75
  37. 326
  38. 27
  39. 51
  40. 73

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