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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 728 · 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. 1.325 + 39 =
  2. 2.481 + 67 =
  3. 3.132 + 67 =
  4. 4.444 + 68 =
  5. 5.163 + 29 =
  6. 6.26 + 37 =
  7. 7.66 + 59 =
  8. 8.297 + 27 =
  9. 9.196 + 98 =
  10. 10.67 + 98 =
  11. 11.309 + 79 =
  12. 12.435 + 79 =
  13. 13.299 + 69 =
  14. 14.317 + 67 =
  15. 15.113 + 89 =
  16. 16.487 + 37 =
  17. 17.79 + 99 =
  18. 18.44 + 69 =
  19. 19.103 + 19 =
  20. 20.484 + 48 =
  21. 21.378 + 39 =
  22. 22.47 + 28 =
  23. 23.39 + 88 =
  24. 24.418 + 17 =
  25. 25.300 + 17 =
  26. 26.335 + 18 =
  27. 27.359 + 49 =
  28. 28.83 + 39 =
  29. 29.282 + 87 =
  30. 30.134 + 48 =
  31. 31.135 + 67 =
  32. 32.81 + 67 =
  33. 33.357 + 97 =
  34. 34.445 + 88 =
  35. 35.221 + 89 =
  36. 36.286 + 98 =
  37. 37.173 + 59 =
  38. 38.379 + 67 =
  39. 39.109 + 48 =
  40. 40.74 + 17 =

Answer key

  1. 364
  2. 548
  3. 199
  4. 512
  5. 192
  6. 63
  7. 125
  8. 324
  9. 294
  10. 165
  11. 388
  12. 514
  13. 368
  14. 384
  15. 202
  16. 524
  17. 178
  18. 113
  19. 122
  20. 532
  21. 417
  22. 75
  23. 127
  24. 435
  25. 317
  26. 353
  27. 408
  28. 122
  29. 369
  30. 182
  31. 202
  32. 148
  33. 454
  34. 533
  35. 310
  36. 384
  37. 232
  38. 446
  39. 157
  40. 91

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