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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 900 · 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. 1.232 + 57 =
  2. 2.299 + 77 =
  3. 3.200 + 67 =
  4. 4.97 + 18 =
  5. 5.90 + 59 =
  6. 6.375 + 17 =
  7. 7.333 + 67 =
  8. 8.52 + 99 =
  9. 9.200 + 59 =
  10. 10.459 + 49 =
  11. 11.487 + 18 =
  12. 12.311 + 47 =
  13. 13.176 + 58 =
  14. 14.376 + 67 =
  15. 15.38 + 88 =
  16. 16.430 + 18 =
  17. 17.300 + 97 =
  18. 18.326 + 87 =
  19. 19.286 + 19 =
  20. 20.380 + 87 =
  21. 21.341 + 57 =
  22. 22.323 + 88 =
  23. 23.40 + 78 =
  24. 24.165 + 87 =
  25. 25.300 + 58 =
  26. 26.142 + 67 =
  27. 27.452 + 87 =
  28. 28.335 + 27 =
  29. 29.284 + 17 =
  30. 30.120 + 39 =
  31. 31.140 + 59 =
  32. 32.109 + 79 =
  33. 33.194 + 77 =
  34. 34.221 + 67 =
  35. 35.255 + 77 =
  36. 36.74 + 97 =
  37. 37.259 + 97 =
  38. 38.361 + 49 =
  39. 39.210 + 49 =
  40. 40.110 + 27 =

Answer key

  1. 289
  2. 376
  3. 267
  4. 115
  5. 149
  6. 392
  7. 400
  8. 151
  9. 259
  10. 508
  11. 505
  12. 358
  13. 234
  14. 443
  15. 126
  16. 448
  17. 397
  18. 413
  19. 305
  20. 467
  21. 398
  22. 411
  23. 118
  24. 252
  25. 358
  26. 209
  27. 539
  28. 362
  29. 301
  30. 159
  31. 199
  32. 188
  33. 271
  34. 288
  35. 332
  36. 171
  37. 356
  38. 410
  39. 259
  40. 137

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