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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 792 · 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. 1.423 + 47 =
  2. 2.353 + 68 =
  3. 3.320 + 88 =
  4. 4.430 + 27 =
  5. 5.100 + 58 =
  6. 6.204 + 38 =
  7. 7.211 + 67 =
  8. 8.442 + 87 =
  9. 9.373 + 47 =
  10. 10.56 + 48 =
  11. 11.494 + 78 =
  12. 12.273 + 77 =
  13. 13.42 + 87 =
  14. 14.130 + 87 =
  15. 15.486 + 78 =
  16. 16.273 + 38 =
  17. 17.482 + 37 =
  18. 18.345 + 47 =
  19. 19.136 + 59 =
  20. 20.466 + 27 =
  21. 21.258 + 47 =
  22. 22.322 + 88 =
  23. 23.478 + 38 =
  24. 24.35 + 78 =
  25. 25.105 + 57 =
  26. 26.221 + 39 =
  27. 27.130 + 48 =
  28. 28.167 + 19 =
  29. 29.388 + 19 =
  30. 30.341 + 67 =
  31. 31.339 + 99 =
  32. 32.310 + 39 =
  33. 33.431 + 17 =
  34. 34.491 + 89 =
  35. 35.314 + 47 =
  36. 36.131 + 29 =
  37. 37.354 + 89 =
  38. 38.271 + 39 =
  39. 39.265 + 28 =
  40. 40.448 + 77 =

Answer key

  1. 470
  2. 421
  3. 408
  4. 457
  5. 158
  6. 242
  7. 278
  8. 529
  9. 420
  10. 104
  11. 572
  12. 350
  13. 129
  14. 217
  15. 564
  16. 311
  17. 519
  18. 392
  19. 195
  20. 493
  21. 305
  22. 410
  23. 516
  24. 113
  25. 162
  26. 260
  27. 178
  28. 186
  29. 407
  30. 408
  31. 438
  32. 349
  33. 448
  34. 580
  35. 361
  36. 160
  37. 443
  38. 310
  39. 293
  40. 525

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