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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 322 · 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. 1.198 + 17 =
  2. 2.40 + 78 =
  3. 3.459 + 18 =
  4. 4.366 + 37 =
  5. 5.272 + 37 =
  6. 6.84 + 37 =
  7. 7.212 + 47 =
  8. 8.39 + 39 =
  9. 9.416 + 58 =
  10. 10.54 + 18 =
  11. 11.450 + 57 =
  12. 12.388 + 67 =
  13. 13.455 + 17 =
  14. 14.325 + 98 =
  15. 15.144 + 49 =
  16. 16.491 + 79 =
  17. 17.339 + 48 =
  18. 18.232 + 68 =
  19. 19.112 + 48 =
  20. 20.236 + 18 =
  21. 21.44 + 49 =
  22. 22.194 + 78 =
  23. 23.149 + 27 =
  24. 24.434 + 18 =
  25. 25.490 + 17 =
  26. 26.212 + 78 =
  27. 27.195 + 97 =
  28. 28.287 + 88 =
  29. 29.254 + 17 =
  30. 30.34 + 27 =
  31. 31.164 + 88 =
  32. 32.455 + 68 =
  33. 33.308 + 87 =
  34. 34.54 + 68 =
  35. 35.170 + 99 =
  36. 36.56 + 38 =
  37. 37.330 + 67 =
  38. 38.273 + 57 =
  39. 39.218 + 57 =
  40. 40.188 + 29 =

Answer key

  1. 215
  2. 118
  3. 477
  4. 403
  5. 309
  6. 121
  7. 259
  8. 78
  9. 474
  10. 72
  11. 507
  12. 455
  13. 472
  14. 423
  15. 193
  16. 570
  17. 387
  18. 300
  19. 160
  20. 254
  21. 93
  22. 272
  23. 176
  24. 452
  25. 507
  26. 290
  27. 292
  28. 375
  29. 271
  30. 61
  31. 252
  32. 523
  33. 395
  34. 122
  35. 269
  36. 94
  37. 397
  38. 330
  39. 275
  40. 217

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