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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 759 · 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. 1.192 + 89 =
  2. 2.391 + 57 =
  3. 3.38 + 28 =
  4. 4.474 + 57 =
  5. 5.277 + 49 =
  6. 6.56 + 17 =
  7. 7.322 + 49 =
  8. 8.69 + 18 =
  9. 9.344 + 59 =
  10. 10.32 + 47 =
  11. 11.264 + 67 =
  12. 12.406 + 99 =
  13. 13.189 + 37 =
  14. 14.373 + 87 =
  15. 15.151 + 67 =
  16. 16.141 + 98 =
  17. 17.244 + 99 =
  18. 18.436 + 28 =
  19. 19.135 + 48 =
  20. 20.325 + 47 =
  21. 21.114 + 58 =
  22. 22.129 + 19 =
  23. 23.378 + 87 =
  24. 24.153 + 57 =
  25. 25.32 + 27 =
  26. 26.491 + 19 =
  27. 27.260 + 49 =
  28. 28.406 + 28 =
  29. 29.460 + 48 =
  30. 30.352 + 47 =
  31. 31.119 + 37 =
  32. 32.208 + 99 =
  33. 33.189 + 37 =
  34. 34.333 + 59 =
  35. 35.316 + 48 =
  36. 36.205 + 67 =
  37. 37.243 + 77 =
  38. 38.297 + 79 =
  39. 39.187 + 29 =
  40. 40.128 + 78 =

Answer key

  1. 281
  2. 448
  3. 66
  4. 531
  5. 326
  6. 73
  7. 371
  8. 87
  9. 403
  10. 79
  11. 331
  12. 505
  13. 226
  14. 460
  15. 218
  16. 239
  17. 343
  18. 464
  19. 183
  20. 372
  21. 172
  22. 148
  23. 465
  24. 210
  25. 59
  26. 510
  27. 309
  28. 434
  29. 508
  30. 399
  31. 156
  32. 307
  33. 226
  34. 392
  35. 364
  36. 272
  37. 320
  38. 376
  39. 216
  40. 206

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