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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 564 · 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. 1.390 + 87 =
  2. 2.30 + 38 =
  3. 3.193 + 89 =
  4. 4.348 + 79 =
  5. 5.106 + 67 =
  6. 6.146 + 67 =
  7. 7.371 + 87 =
  8. 8.415 + 38 =
  9. 9.341 + 27 =
  10. 10.32 + 99 =
  11. 11.135 + 39 =
  12. 12.118 + 39 =
  13. 13.164 + 17 =
  14. 14.232 + 39 =
  15. 15.117 + 87 =
  16. 16.115 + 39 =
  17. 17.70 + 69 =
  18. 18.335 + 37 =
  19. 19.351 + 68 =
  20. 20.94 + 79 =
  21. 21.218 + 19 =
  22. 22.300 + 29 =
  23. 23.257 + 27 =
  24. 24.258 + 59 =
  25. 25.308 + 89 =
  26. 26.57 + 78 =
  27. 27.312 + 49 =
  28. 28.163 + 18 =
  29. 29.183 + 27 =
  30. 30.165 + 47 =
  31. 31.179 + 97 =
  32. 32.154 + 57 =
  33. 33.314 + 99 =
  34. 34.320 + 19 =
  35. 35.290 + 28 =
  36. 36.493 + 17 =
  37. 37.472 + 47 =
  38. 38.361 + 37 =
  39. 39.413 + 47 =
  40. 40.332 + 49 =

Answer key

  1. 477
  2. 68
  3. 282
  4. 427
  5. 173
  6. 213
  7. 458
  8. 453
  9. 368
  10. 131
  11. 174
  12. 157
  13. 181
  14. 271
  15. 204
  16. 154
  17. 139
  18. 372
  19. 419
  20. 173
  21. 237
  22. 329
  23. 284
  24. 317
  25. 397
  26. 135
  27. 361
  28. 181
  29. 210
  30. 212
  31. 276
  32. 211
  33. 413
  34. 339
  35. 318
  36. 510
  37. 519
  38. 398
  39. 460
  40. 381

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