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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 546 · 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. 1.488 + 38 =
  2. 2.492 + 38 =
  3. 3.352 + 49 =
  4. 4.134 + 79 =
  5. 5.426 + 18 =
  6. 6.436 + 89 =
  7. 7.89 + 68 =
  8. 8.102 + 79 =
  9. 9.195 + 38 =
  10. 10.109 + 37 =
  11. 11.103 + 77 =
  12. 12.236 + 37 =
  13. 13.219 + 47 =
  14. 14.66 + 39 =
  15. 15.57 + 97 =
  16. 16.70 + 57 =
  17. 17.397 + 47 =
  18. 18.289 + 49 =
  19. 19.126 + 37 =
  20. 20.310 + 47 =
  21. 21.440 + 28 =
  22. 22.413 + 48 =
  23. 23.233 + 17 =
  24. 24.426 + 48 =
  25. 25.437 + 38 =
  26. 26.215 + 77 =
  27. 27.40 + 68 =
  28. 28.97 + 58 =
  29. 29.156 + 87 =
  30. 30.284 + 77 =
  31. 31.415 + 48 =
  32. 32.279 + 98 =
  33. 33.328 + 48 =
  34. 34.201 + 19 =
  35. 35.149 + 17 =
  36. 36.76 + 19 =
  37. 37.468 + 57 =
  38. 38.108 + 19 =
  39. 39.315 + 59 =
  40. 40.242 + 37 =

Answer key

  1. 526
  2. 530
  3. 401
  4. 213
  5. 444
  6. 525
  7. 157
  8. 181
  9. 233
  10. 146
  11. 180
  12. 273
  13. 266
  14. 105
  15. 154
  16. 127
  17. 444
  18. 338
  19. 163
  20. 357
  21. 468
  22. 461
  23. 250
  24. 474
  25. 475
  26. 292
  27. 108
  28. 155
  29. 243
  30. 361
  31. 463
  32. 377
  33. 376
  34. 220
  35. 166
  36. 95
  37. 525
  38. 127
  39. 374
  40. 279

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