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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 918 · 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. 1.278 + 99 =
  2. 2.309 + 57 =
  3. 3.332 + 97 =
  4. 4.217 + 48 =
  5. 5.66 + 48 =
  6. 6.95 + 28 =
  7. 7.297 + 18 =
  8. 8.67 + 78 =
  9. 9.444 + 57 =
  10. 10.112 + 39 =
  11. 11.127 + 38 =
  12. 12.41 + 98 =
  13. 13.45 + 88 =
  14. 14.50 + 88 =
  15. 15.178 + 39 =
  16. 16.97 + 47 =
  17. 17.388 + 48 =
  18. 18.465 + 17 =
  19. 19.436 + 28 =
  20. 20.359 + 39 =
  21. 21.59 + 37 =
  22. 22.160 + 89 =
  23. 23.155 + 99 =
  24. 24.79 + 28 =
  25. 25.84 + 18 =
  26. 26.391 + 98 =
  27. 27.382 + 69 =
  28. 28.381 + 17 =
  29. 29.47 + 28 =
  30. 30.35 + 89 =
  31. 31.405 + 28 =
  32. 32.181 + 29 =
  33. 33.25 + 18 =
  34. 34.374 + 68 =
  35. 35.150 + 58 =
  36. 36.324 + 39 =
  37. 37.98 + 39 =
  38. 38.155 + 27 =
  39. 39.74 + 88 =
  40. 40.318 + 77 =

Answer key

  1. 377
  2. 366
  3. 429
  4. 265
  5. 114
  6. 123
  7. 315
  8. 145
  9. 501
  10. 151
  11. 165
  12. 139
  13. 133
  14. 138
  15. 217
  16. 144
  17. 436
  18. 482
  19. 464
  20. 398
  21. 96
  22. 249
  23. 254
  24. 107
  25. 102
  26. 489
  27. 451
  28. 398
  29. 75
  30. 124
  31. 433
  32. 210
  33. 43
  34. 442
  35. 208
  36. 363
  37. 137
  38. 182
  39. 162
  40. 395

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