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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 878 · 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. 1.381 + 87 =
  2. 2.28 + 39 =
  3. 3.149 + 28 =
  4. 4.97 + 57 =
  5. 5.157 + 88 =
  6. 6.437 + 78 =
  7. 7.270 + 18 =
  8. 8.250 + 29 =
  9. 9.273 + 59 =
  10. 10.324 + 79 =
  11. 11.33 + 58 =
  12. 12.475 + 98 =
  13. 13.104 + 78 =
  14. 14.119 + 57 =
  15. 15.128 + 39 =
  16. 16.375 + 68 =
  17. 17.371 + 19 =
  18. 18.292 + 88 =
  19. 19.457 + 19 =
  20. 20.280 + 77 =
  21. 21.120 + 57 =
  22. 22.207 + 38 =
  23. 23.130 + 18 =
  24. 24.283 + 89 =
  25. 25.322 + 78 =
  26. 26.45 + 88 =
  27. 27.461 + 29 =
  28. 28.343 + 39 =
  29. 29.82 + 79 =
  30. 30.466 + 67 =
  31. 31.395 + 78 =
  32. 32.238 + 78 =
  33. 33.145 + 69 =
  34. 34.39 + 39 =
  35. 35.441 + 67 =
  36. 36.276 + 97 =
  37. 37.175 + 67 =
  38. 38.48 + 98 =
  39. 39.182 + 89 =
  40. 40.235 + 87 =

Answer key

  1. 468
  2. 67
  3. 177
  4. 154
  5. 245
  6. 515
  7. 288
  8. 279
  9. 332
  10. 403
  11. 91
  12. 573
  13. 182
  14. 176
  15. 167
  16. 443
  17. 390
  18. 380
  19. 476
  20. 357
  21. 177
  22. 245
  23. 148
  24. 372
  25. 400
  26. 133
  27. 490
  28. 382
  29. 161
  30. 533
  31. 473
  32. 316
  33. 214
  34. 78
  35. 508
  36. 373
  37. 242
  38. 146
  39. 271
  40. 322

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