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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 126 · 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. 1.311 + 57 =
  2. 2.55 + 28 =
  3. 3.78 + 47 =
  4. 4.26 + 17 =
  5. 5.383 + 99 =
  6. 6.141 + 99 =
  7. 7.214 + 99 =
  8. 8.426 + 39 =
  9. 9.496 + 97 =
  10. 10.474 + 89 =
  11. 11.336 + 58 =
  12. 12.168 + 37 =
  13. 13.396 + 37 =
  14. 14.248 + 37 =
  15. 15.102 + 67 =
  16. 16.197 + 48 =
  17. 17.360 + 17 =
  18. 18.391 + 77 =
  19. 19.147 + 47 =
  20. 20.222 + 19 =
  21. 21.428 + 17 =
  22. 22.153 + 48 =
  23. 23.203 + 39 =
  24. 24.42 + 98 =
  25. 25.327 + 49 =
  26. 26.108 + 87 =
  27. 27.189 + 77 =
  28. 28.491 + 97 =
  29. 29.368 + 68 =
  30. 30.165 + 99 =
  31. 31.36 + 68 =
  32. 32.52 + 87 =
  33. 33.163 + 78 =
  34. 34.91 + 38 =
  35. 35.193 + 88 =
  36. 36.150 + 27 =
  37. 37.472 + 17 =
  38. 38.266 + 39 =
  39. 39.129 + 98 =
  40. 40.459 + 78 =

Answer key

  1. 368
  2. 83
  3. 125
  4. 43
  5. 482
  6. 240
  7. 313
  8. 465
  9. 593
  10. 563
  11. 394
  12. 205
  13. 433
  14. 285
  15. 169
  16. 245
  17. 377
  18. 468
  19. 194
  20. 241
  21. 445
  22. 201
  23. 242
  24. 140
  25. 376
  26. 195
  27. 266
  28. 588
  29. 436
  30. 264
  31. 104
  32. 139
  33. 241
  34. 129
  35. 281
  36. 177
  37. 489
  38. 305
  39. 227
  40. 537

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