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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 59 · 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. 1.445 + 19 =
  2. 2.375 + 49 =
  3. 3.476 + 17 =
  4. 4.81 + 59 =
  5. 5.229 + 58 =
  6. 6.485 + 17 =
  7. 7.471 + 18 =
  8. 8.36 + 59 =
  9. 9.201 + 27 =
  10. 10.165 + 78 =
  11. 11.398 + 79 =
  12. 12.103 + 57 =
  13. 13.456 + 17 =
  14. 14.106 + 98 =
  15. 15.461 + 79 =
  16. 16.347 + 39 =
  17. 17.38 + 17 =
  18. 18.315 + 37 =
  19. 19.394 + 38 =
  20. 20.398 + 48 =
  21. 21.470 + 28 =
  22. 22.415 + 79 =
  23. 23.113 + 77 =
  24. 24.398 + 57 =
  25. 25.403 + 18 =
  26. 26.396 + 58 =
  27. 27.343 + 18 =
  28. 28.65 + 68 =
  29. 29.205 + 99 =
  30. 30.333 + 58 =
  31. 31.270 + 88 =
  32. 32.333 + 27 =
  33. 33.155 + 29 =
  34. 34.309 + 48 =
  35. 35.493 + 58 =
  36. 36.30 + 19 =
  37. 37.251 + 68 =
  38. 38.109 + 49 =
  39. 39.169 + 88 =
  40. 40.152 + 38 =

Answer key

  1. 464
  2. 424
  3. 493
  4. 140
  5. 287
  6. 502
  7. 489
  8. 95
  9. 228
  10. 243
  11. 477
  12. 160
  13. 473
  14. 204
  15. 540
  16. 386
  17. 55
  18. 352
  19. 432
  20. 446
  21. 498
  22. 494
  23. 190
  24. 455
  25. 421
  26. 454
  27. 361
  28. 133
  29. 304
  30. 391
  31. 358
  32. 360
  33. 184
  34. 357
  35. 551
  36. 49
  37. 319
  38. 158
  39. 257
  40. 190

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