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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 877 · 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. 1.308 + 87 =
  2. 2.185 + 17 =
  3. 3.482 + 59 =
  4. 4.366 + 29 =
  5. 5.389 + 87 =
  6. 6.417 + 47 =
  7. 7.55 + 47 =
  8. 8.214 + 89 =
  9. 9.240 + 27 =
  10. 10.335 + 78 =
  11. 11.396 + 49 =
  12. 12.85 + 47 =
  13. 13.184 + 28 =
  14. 14.174 + 68 =
  15. 15.111 + 18 =
  16. 16.110 + 79 =
  17. 17.68 + 99 =
  18. 18.232 + 49 =
  19. 19.177 + 39 =
  20. 20.141 + 27 =
  21. 21.38 + 39 =
  22. 22.267 + 39 =
  23. 23.183 + 48 =
  24. 24.263 + 18 =
  25. 25.381 + 29 =
  26. 26.98 + 28 =
  27. 27.38 + 29 =
  28. 28.461 + 17 =
  29. 29.182 + 77 =
  30. 30.349 + 69 =
  31. 31.185 + 58 =
  32. 32.464 + 79 =
  33. 33.181 + 58 =
  34. 34.399 + 49 =
  35. 35.466 + 57 =
  36. 36.388 + 97 =
  37. 37.253 + 47 =
  38. 38.125 + 39 =
  39. 39.175 + 58 =
  40. 40.311 + 78 =

Answer key

  1. 395
  2. 202
  3. 541
  4. 395
  5. 476
  6. 464
  7. 102
  8. 303
  9. 267
  10. 413
  11. 445
  12. 132
  13. 212
  14. 242
  15. 129
  16. 189
  17. 167
  18. 281
  19. 216
  20. 168
  21. 77
  22. 306
  23. 231
  24. 281
  25. 410
  26. 126
  27. 67
  28. 478
  29. 259
  30. 418
  31. 243
  32. 543
  33. 239
  34. 448
  35. 523
  36. 485
  37. 300
  38. 164
  39. 233
  40. 389

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