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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 702 · 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. 1.157 + 28 =
  2. 2.137 + 19 =
  3. 3.66 + 39 =
  4. 4.381 + 97 =
  5. 5.356 + 78 =
  6. 6.340 + 47 =
  7. 7.164 + 78 =
  8. 8.167 + 39 =
  9. 9.204 + 97 =
  10. 10.483 + 98 =
  11. 11.183 + 68 =
  12. 12.26 + 97 =
  13. 13.180 + 89 =
  14. 14.275 + 57 =
  15. 15.419 + 67 =
  16. 16.69 + 28 =
  17. 17.316 + 28 =
  18. 18.248 + 77 =
  19. 19.176 + 47 =
  20. 20.434 + 39 =
  21. 21.196 + 28 =
  22. 22.54 + 39 =
  23. 23.356 + 18 =
  24. 24.425 + 77 =
  25. 25.182 + 48 =
  26. 26.257 + 79 =
  27. 27.194 + 19 =
  28. 28.476 + 78 =
  29. 29.470 + 17 =
  30. 30.281 + 77 =
  31. 31.196 + 57 =
  32. 32.39 + 58 =
  33. 33.365 + 87 =
  34. 34.318 + 68 =
  35. 35.333 + 49 =
  36. 36.485 + 88 =
  37. 37.495 + 59 =
  38. 38.495 + 37 =
  39. 39.193 + 59 =
  40. 40.379 + 78 =

Answer key

  1. 185
  2. 156
  3. 105
  4. 478
  5. 434
  6. 387
  7. 242
  8. 206
  9. 301
  10. 581
  11. 251
  12. 123
  13. 269
  14. 332
  15. 486
  16. 97
  17. 344
  18. 325
  19. 223
  20. 473
  21. 224
  22. 93
  23. 374
  24. 502
  25. 230
  26. 336
  27. 213
  28. 554
  29. 487
  30. 358
  31. 253
  32. 97
  33. 452
  34. 386
  35. 382
  36. 573
  37. 554
  38. 532
  39. 252
  40. 457

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