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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 916 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.229 + 38 =
  2. 2.32 + 57 =
  3. 3.485 + 59 =
  4. 4.149 + 17 =
  5. 5.159 + 38 =
  6. 6.34 + 19 =
  7. 7.274 + 58 =
  8. 8.388 + 58 =
  9. 9.316 + 99 =
  10. 10.85 + 87 =
  11. 11.211 + 79 =
  12. 12.317 + 48 =
  13. 13.466 + 29 =
  14. 14.289 + 68 =
  15. 15.134 + 87 =
  16. 16.456 + 57 =
  17. 17.183 + 38 =
  18. 18.97 + 98 =
  19. 19.493 + 28 =
  20. 20.81 + 59 =
  21. 21.458 + 78 =
  22. 22.86 + 49 =
  23. 23.468 + 48 =
  24. 24.120 + 89 =
  25. 25.101 + 78 =
  26. 26.60 + 28 =
  27. 27.380 + 88 =
  28. 28.309 + 69 =
  29. 29.368 + 88 =
  30. 30.72 + 57 =
  31. 31.167 + 47 =
  32. 32.228 + 38 =
  33. 33.388 + 27 =
  34. 34.250 + 19 =
  35. 35.303 + 47 =
  36. 36.39 + 79 =
  37. 37.88 + 79 =
  38. 38.81 + 99 =
  39. 39.70 + 18 =
  40. 40.271 + 58 =

Answer key

  1. 267
  2. 89
  3. 544
  4. 166
  5. 197
  6. 53
  7. 332
  8. 446
  9. 415
  10. 172
  11. 290
  12. 365
  13. 495
  14. 357
  15. 221
  16. 513
  17. 221
  18. 195
  19. 521
  20. 140
  21. 536
  22. 135
  23. 516
  24. 209
  25. 179
  26. 88
  27. 468
  28. 378
  29. 456
  30. 129
  31. 214
  32. 266
  33. 415
  34. 269
  35. 350
  36. 118
  37. 167
  38. 180
  39. 88
  40. 329

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