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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 627 · 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. 1.495 + 68 =
  2. 2.246 + 29 =
  3. 3.422 + 67 =
  4. 4.393 + 58 =
  5. 5.335 + 99 =
  6. 6.151 + 19 =
  7. 7.393 + 89 =
  8. 8.105 + 87 =
  9. 9.306 + 67 =
  10. 10.390 + 97 =
  11. 11.39 + 38 =
  12. 12.390 + 18 =
  13. 13.91 + 39 =
  14. 14.493 + 67 =
  15. 15.488 + 38 =
  16. 16.326 + 18 =
  17. 17.334 + 78 =
  18. 18.82 + 79 =
  19. 19.333 + 69 =
  20. 20.176 + 97 =
  21. 21.204 + 29 =
  22. 22.213 + 98 =
  23. 23.290 + 47 =
  24. 24.31 + 29 =
  25. 25.81 + 27 =
  26. 26.224 + 68 =
  27. 27.263 + 18 =
  28. 28.49 + 79 =
  29. 29.467 + 17 =
  30. 30.392 + 97 =
  31. 31.346 + 78 =
  32. 32.462 + 68 =
  33. 33.375 + 88 =
  34. 34.75 + 27 =
  35. 35.273 + 67 =
  36. 36.367 + 28 =
  37. 37.251 + 57 =
  38. 38.38 + 19 =
  39. 39.113 + 77 =
  40. 40.472 + 38 =

Answer key

  1. 563
  2. 275
  3. 489
  4. 451
  5. 434
  6. 170
  7. 482
  8. 192
  9. 373
  10. 487
  11. 77
  12. 408
  13. 130
  14. 560
  15. 526
  16. 344
  17. 412
  18. 161
  19. 402
  20. 273
  21. 233
  22. 311
  23. 337
  24. 60
  25. 108
  26. 292
  27. 281
  28. 128
  29. 484
  30. 489
  31. 424
  32. 530
  33. 463
  34. 102
  35. 340
  36. 395
  37. 308
  38. 57
  39. 190
  40. 510

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