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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 883 · 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. 1.54 + 88 =
  2. 2.487 + 18 =
  3. 3.198 + 39 =
  4. 4.78 + 99 =
  5. 5.168 + 58 =
  6. 6.322 + 58 =
  7. 7.125 + 37 =
  8. 8.449 + 77 =
  9. 9.194 + 67 =
  10. 10.179 + 17 =
  11. 11.290 + 29 =
  12. 12.472 + 79 =
  13. 13.132 + 49 =
  14. 14.410 + 28 =
  15. 15.195 + 18 =
  16. 16.269 + 68 =
  17. 17.115 + 29 =
  18. 18.311 + 39 =
  19. 19.263 + 79 =
  20. 20.87 + 38 =
  21. 21.52 + 29 =
  22. 22.172 + 68 =
  23. 23.253 + 77 =
  24. 24.217 + 68 =
  25. 25.172 + 58 =
  26. 26.29 + 87 =
  27. 27.201 + 78 =
  28. 28.119 + 39 =
  29. 29.153 + 79 =
  30. 30.417 + 67 =
  31. 31.489 + 48 =
  32. 32.436 + 78 =
  33. 33.165 + 67 =
  34. 34.205 + 68 =
  35. 35.124 + 29 =
  36. 36.411 + 59 =
  37. 37.334 + 27 =
  38. 38.462 + 37 =
  39. 39.230 + 28 =
  40. 40.358 + 18 =

Answer key

  1. 142
  2. 505
  3. 237
  4. 177
  5. 226
  6. 380
  7. 162
  8. 526
  9. 261
  10. 196
  11. 319
  12. 551
  13. 181
  14. 438
  15. 213
  16. 337
  17. 144
  18. 350
  19. 342
  20. 125
  21. 81
  22. 240
  23. 330
  24. 285
  25. 230
  26. 116
  27. 279
  28. 158
  29. 232
  30. 484
  31. 537
  32. 514
  33. 232
  34. 273
  35. 153
  36. 470
  37. 361
  38. 499
  39. 258
  40. 376

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