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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 674 · 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. 1.17 + 9 =
  2. 2.42 − 19 =
  3. 3.33 − 29 =
  4. 4.442 − 99 =
  5. 5.28 − 19 =
  6. 6.71 + 9 =
  7. 7.75 + 19 =
  8. 8.52 − 29 =
  9. 9.56 + 19 =
  10. 10.187 + 99 =
  11. 11.153 + 99 =
  12. 12.40 + 19 =
  13. 13.18 + 19 =
  14. 14.15 + 19 =
  15. 15.812 − 99 =
  16. 16.184 + 99 =
  17. 17.31 − 19 =
  18. 18.78 − 29 =
  19. 19.438 + 99 =
  20. 20.295 + 99 =
  21. 21.71 − 29 =
  22. 22.14 + 9 =
  23. 23.264 − 99 =
  24. 24.106 − 29 =
  25. 25.26 + 19 =
  26. 26.26 − 9 =
  27. 27.47 + 29 =
  28. 28.125 + 99 =
  29. 29.38 − 19 =
  30. 30.24 + 9 =
  31. 31.99 − 29 =
  32. 32.382 + 99 =
  33. 33.71 − 9 =
  34. 34.61 − 19 =
  35. 35.48 − 29 =
  36. 36.40 + 29 =
  37. 37.252 − 99 =
  38. 38.20 − 9 =
  39. 39.668 + 99 =
  40. 40.25 + 19 =

Answer key

  1. 26
  2. 23
  3. 4
  4. 343
  5. 9
  6. 80
  7. 94
  8. 23
  9. 75
  10. 286
  11. 252
  12. 59
  13. 37
  14. 34
  15. 713
  16. 283
  17. 12
  18. 49
  19. 537
  20. 394
  21. 42
  22. 23
  23. 165
  24. 77
  25. 45
  26. 17
  27. 76
  28. 224
  29. 19
  30. 33
  31. 70
  32. 481
  33. 62
  34. 42
  35. 19
  36. 69
  37. 153
  38. 11
  39. 767
  40. 44

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