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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 806 · 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. 1.280 + 17 =
  2. 2.118 + 39 =
  3. 3.370 + 79 =
  4. 4.493 + 99 =
  5. 5.208 + 38 =
  6. 6.36 + 29 =
  7. 7.387 + 59 =
  8. 8.118 + 38 =
  9. 9.453 + 97 =
  10. 10.32 + 39 =
  11. 11.61 + 97 =
  12. 12.135 + 28 =
  13. 13.29 + 18 =
  14. 14.436 + 67 =
  15. 15.258 + 38 =
  16. 16.115 + 89 =
  17. 17.169 + 28 =
  18. 18.420 + 98 =
  19. 19.469 + 47 =
  20. 20.185 + 27 =
  21. 21.290 + 27 =
  22. 22.474 + 17 =
  23. 23.92 + 59 =
  24. 24.397 + 59 =
  25. 25.270 + 99 =
  26. 26.43 + 98 =
  27. 27.111 + 17 =
  28. 28.108 + 18 =
  29. 29.262 + 27 =
  30. 30.163 + 27 =
  31. 31.88 + 97 =
  32. 32.247 + 89 =
  33. 33.163 + 59 =
  34. 34.299 + 49 =
  35. 35.139 + 37 =
  36. 36.361 + 58 =
  37. 37.70 + 47 =
  38. 38.291 + 39 =
  39. 39.66 + 67 =
  40. 40.59 + 48 =

Answer key

  1. 297
  2. 157
  3. 449
  4. 592
  5. 246
  6. 65
  7. 446
  8. 156
  9. 550
  10. 71
  11. 158
  12. 163
  13. 47
  14. 503
  15. 296
  16. 204
  17. 197
  18. 518
  19. 516
  20. 212
  21. 317
  22. 491
  23. 151
  24. 456
  25. 369
  26. 141
  27. 128
  28. 126
  29. 289
  30. 190
  31. 185
  32. 336
  33. 222
  34. 348
  35. 176
  36. 419
  37. 117
  38. 330
  39. 133
  40. 107

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