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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 125 · 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. 1.182 + 68 =
  2. 2.332 + 17 =
  3. 3.399 + 79 =
  4. 4.28 + 28 =
  5. 5.471 + 19 =
  6. 6.267 + 87 =
  7. 7.472 + 38 =
  8. 8.408 + 58 =
  9. 9.108 + 39 =
  10. 10.413 + 97 =
  11. 11.198 + 97 =
  12. 12.120 + 28 =
  13. 13.433 + 47 =
  14. 14.47 + 18 =
  15. 15.125 + 99 =
  16. 16.63 + 39 =
  17. 17.320 + 48 =
  18. 18.448 + 68 =
  19. 19.154 + 29 =
  20. 20.70 + 18 =
  21. 21.117 + 47 =
  22. 22.43 + 98 =
  23. 23.342 + 47 =
  24. 24.224 + 29 =
  25. 25.204 + 99 =
  26. 26.165 + 48 =
  27. 27.255 + 57 =
  28. 28.409 + 48 =
  29. 29.361 + 99 =
  30. 30.485 + 98 =
  31. 31.98 + 57 =
  32. 32.177 + 57 =
  33. 33.323 + 58 =
  34. 34.323 + 88 =
  35. 35.292 + 58 =
  36. 36.247 + 97 =
  37. 37.63 + 77 =
  38. 38.425 + 27 =
  39. 39.113 + 37 =
  40. 40.347 + 49 =

Answer key

  1. 250
  2. 349
  3. 478
  4. 56
  5. 490
  6. 354
  7. 510
  8. 466
  9. 147
  10. 510
  11. 295
  12. 148
  13. 480
  14. 65
  15. 224
  16. 102
  17. 368
  18. 516
  19. 183
  20. 88
  21. 164
  22. 141
  23. 389
  24. 253
  25. 303
  26. 213
  27. 312
  28. 457
  29. 460
  30. 583
  31. 155
  32. 234
  33. 381
  34. 411
  35. 350
  36. 344
  37. 140
  38. 452
  39. 150
  40. 396

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