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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 937 · 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. 1.130 + 68 =
  2. 2.101 + 68 =
  3. 3.303 + 29 =
  4. 4.224 + 57 =
  5. 5.191 + 49 =
  6. 6.492 + 17 =
  7. 7.226 + 58 =
  8. 8.364 + 57 =
  9. 9.201 + 27 =
  10. 10.461 + 37 =
  11. 11.306 + 38 =
  12. 12.289 + 57 =
  13. 13.86 + 17 =
  14. 14.320 + 57 =
  15. 15.369 + 38 =
  16. 16.97 + 48 =
  17. 17.28 + 37 =
  18. 18.314 + 37 =
  19. 19.485 + 97 =
  20. 20.428 + 87 =
  21. 21.142 + 87 =
  22. 22.126 + 97 =
  23. 23.461 + 89 =
  24. 24.388 + 88 =
  25. 25.136 + 29 =
  26. 26.334 + 97 =
  27. 27.309 + 17 =
  28. 28.81 + 78 =
  29. 29.399 + 27 =
  30. 30.324 + 37 =
  31. 31.387 + 28 =
  32. 32.71 + 37 =
  33. 33.299 + 57 =
  34. 34.272 + 28 =
  35. 35.406 + 47 =
  36. 36.468 + 59 =
  37. 37.307 + 28 =
  38. 38.347 + 17 =
  39. 39.130 + 58 =
  40. 40.34 + 39 =

Answer key

  1. 198
  2. 169
  3. 332
  4. 281
  5. 240
  6. 509
  7. 284
  8. 421
  9. 228
  10. 498
  11. 344
  12. 346
  13. 103
  14. 377
  15. 407
  16. 145
  17. 65
  18. 351
  19. 582
  20. 515
  21. 229
  22. 223
  23. 550
  24. 476
  25. 165
  26. 431
  27. 326
  28. 159
  29. 426
  30. 361
  31. 415
  32. 108
  33. 356
  34. 300
  35. 453
  36. 527
  37. 335
  38. 364
  39. 188
  40. 73

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