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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 586 · 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. 1.166 + 59 =
  2. 2.89 + 17 =
  3. 3.32 + 19 =
  4. 4.155 + 58 =
  5. 5.35 + 78 =
  6. 6.83 + 57 =
  7. 7.290 + 78 =
  8. 8.499 + 97 =
  9. 9.214 + 59 =
  10. 10.203 + 49 =
  11. 11.324 + 17 =
  12. 12.285 + 59 =
  13. 13.40 + 17 =
  14. 14.91 + 38 =
  15. 15.449 + 48 =
  16. 16.465 + 59 =
  17. 17.262 + 78 =
  18. 18.440 + 28 =
  19. 19.487 + 69 =
  20. 20.400 + 39 =
  21. 21.335 + 19 =
  22. 22.88 + 77 =
  23. 23.142 + 59 =
  24. 24.278 + 59 =
  25. 25.41 + 27 =
  26. 26.215 + 69 =
  27. 27.425 + 59 =
  28. 28.382 + 57 =
  29. 29.148 + 17 =
  30. 30.127 + 67 =
  31. 31.289 + 37 =
  32. 32.379 + 87 =
  33. 33.205 + 19 =
  34. 34.382 + 29 =
  35. 35.367 + 87 =
  36. 36.486 + 28 =
  37. 37.228 + 57 =
  38. 38.103 + 59 =
  39. 39.99 + 48 =
  40. 40.84 + 88 =

Answer key

  1. 225
  2. 106
  3. 51
  4. 213
  5. 113
  6. 140
  7. 368
  8. 596
  9. 273
  10. 252
  11. 341
  12. 344
  13. 57
  14. 129
  15. 497
  16. 524
  17. 340
  18. 468
  19. 556
  20. 439
  21. 354
  22. 165
  23. 201
  24. 337
  25. 68
  26. 284
  27. 484
  28. 439
  29. 165
  30. 194
  31. 326
  32. 466
  33. 224
  34. 411
  35. 454
  36. 514
  37. 285
  38. 162
  39. 147
  40. 172

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