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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 859 · 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. 1.154 + 98 =
  2. 2.367 + 69 =
  3. 3.168 + 17 =
  4. 4.109 + 27 =
  5. 5.84 + 48 =
  6. 6.81 + 19 =
  7. 7.219 + 69 =
  8. 8.332 + 49 =
  9. 9.298 + 79 =
  10. 10.322 + 79 =
  11. 11.352 + 99 =
  12. 12.476 + 67 =
  13. 13.118 + 97 =
  14. 14.216 + 77 =
  15. 15.335 + 19 =
  16. 16.144 + 18 =
  17. 17.143 + 28 =
  18. 18.99 + 67 =
  19. 19.62 + 18 =
  20. 20.441 + 17 =
  21. 21.346 + 59 =
  22. 22.468 + 17 =
  23. 23.460 + 67 =
  24. 24.117 + 17 =
  25. 25.184 + 69 =
  26. 26.459 + 27 =
  27. 27.267 + 89 =
  28. 28.65 + 18 =
  29. 29.429 + 69 =
  30. 30.294 + 57 =
  31. 31.493 + 87 =
  32. 32.73 + 98 =
  33. 33.460 + 28 =
  34. 34.131 + 79 =
  35. 35.460 + 77 =
  36. 36.478 + 19 =
  37. 37.354 + 27 =
  38. 38.485 + 58 =
  39. 39.483 + 29 =
  40. 40.191 + 69 =

Answer key

  1. 252
  2. 436
  3. 185
  4. 136
  5. 132
  6. 100
  7. 288
  8. 381
  9. 377
  10. 401
  11. 451
  12. 543
  13. 215
  14. 293
  15. 354
  16. 162
  17. 171
  18. 166
  19. 80
  20. 458
  21. 405
  22. 485
  23. 527
  24. 134
  25. 253
  26. 486
  27. 356
  28. 83
  29. 498
  30. 351
  31. 580
  32. 171
  33. 488
  34. 210
  35. 537
  36. 497
  37. 381
  38. 543
  39. 512
  40. 260

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