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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 582 · 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. 1.267 + 59 =
  2. 2.198 + 37 =
  3. 3.105 + 78 =
  4. 4.439 + 68 =
  5. 5.202 + 98 =
  6. 6.94 + 38 =
  7. 7.225 + 89 =
  8. 8.355 + 18 =
  9. 9.361 + 98 =
  10. 10.379 + 69 =
  11. 11.245 + 98 =
  12. 12.88 + 28 =
  13. 13.271 + 57 =
  14. 14.84 + 98 =
  15. 15.147 + 58 =
  16. 16.75 + 59 =
  17. 17.393 + 49 =
  18. 18.350 + 87 =
  19. 19.325 + 79 =
  20. 20.120 + 38 =
  21. 21.140 + 27 =
  22. 22.444 + 69 =
  23. 23.37 + 69 =
  24. 24.428 + 37 =
  25. 25.338 + 18 =
  26. 26.339 + 37 =
  27. 27.423 + 19 =
  28. 28.406 + 59 =
  29. 29.267 + 49 =
  30. 30.149 + 68 =
  31. 31.271 + 67 =
  32. 32.137 + 77 =
  33. 33.85 + 18 =
  34. 34.479 + 57 =
  35. 35.245 + 69 =
  36. 36.394 + 38 =
  37. 37.468 + 38 =
  38. 38.52 + 67 =
  39. 39.405 + 77 =
  40. 40.53 + 37 =

Answer key

  1. 326
  2. 235
  3. 183
  4. 507
  5. 300
  6. 132
  7. 314
  8. 373
  9. 459
  10. 448
  11. 343
  12. 116
  13. 328
  14. 182
  15. 205
  16. 134
  17. 442
  18. 437
  19. 404
  20. 158
  21. 167
  22. 513
  23. 106
  24. 465
  25. 356
  26. 376
  27. 442
  28. 465
  29. 316
  30. 217
  31. 338
  32. 214
  33. 103
  34. 536
  35. 314
  36. 432
  37. 506
  38. 119
  39. 482
  40. 90

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