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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 325 · 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. 1.136 + 27 =
  2. 2.199 + 58 =
  3. 3.140 + 29 =
  4. 4.230 + 68 =
  5. 5.435 + 47 =
  6. 6.243 + 49 =
  7. 7.452 + 19 =
  8. 8.450 + 27 =
  9. 9.273 + 17 =
  10. 10.311 + 58 =
  11. 11.478 + 17 =
  12. 12.118 + 97 =
  13. 13.389 + 67 =
  14. 14.220 + 57 =
  15. 15.159 + 78 =
  16. 16.323 + 57 =
  17. 17.337 + 18 =
  18. 18.433 + 89 =
  19. 19.387 + 48 =
  20. 20.411 + 68 =
  21. 21.364 + 97 =
  22. 22.103 + 19 =
  23. 23.263 + 18 =
  24. 24.493 + 78 =
  25. 25.340 + 57 =
  26. 26.194 + 29 =
  27. 27.256 + 87 =
  28. 28.408 + 99 =
  29. 29.109 + 49 =
  30. 30.244 + 18 =
  31. 31.158 + 57 =
  32. 32.55 + 57 =
  33. 33.390 + 78 =
  34. 34.152 + 69 =
  35. 35.140 + 89 =
  36. 36.29 + 49 =
  37. 37.263 + 88 =
  38. 38.478 + 97 =
  39. 39.286 + 47 =
  40. 40.46 + 18 =

Answer key

  1. 163
  2. 257
  3. 169
  4. 298
  5. 482
  6. 292
  7. 471
  8. 477
  9. 290
  10. 369
  11. 495
  12. 215
  13. 456
  14. 277
  15. 237
  16. 380
  17. 355
  18. 522
  19. 435
  20. 479
  21. 461
  22. 122
  23. 281
  24. 571
  25. 397
  26. 223
  27. 343
  28. 507
  29. 158
  30. 262
  31. 215
  32. 112
  33. 468
  34. 221
  35. 229
  36. 78
  37. 351
  38. 575
  39. 333
  40. 64

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