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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 652 · 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. 1.43 + 28 =
  2. 2.223 + 99 =
  3. 3.253 + 58 =
  4. 4.98 + 58 =
  5. 5.186 + 69 =
  6. 6.404 + 48 =
  7. 7.436 + 18 =
  8. 8.451 + 79 =
  9. 9.173 + 18 =
  10. 10.209 + 69 =
  11. 11.220 + 49 =
  12. 12.110 + 68 =
  13. 13.291 + 87 =
  14. 14.232 + 67 =
  15. 15.453 + 99 =
  16. 16.173 + 68 =
  17. 17.186 + 37 =
  18. 18.431 + 17 =
  19. 19.113 + 69 =
  20. 20.336 + 48 =
  21. 21.278 + 79 =
  22. 22.337 + 48 =
  23. 23.166 + 29 =
  24. 24.399 + 49 =
  25. 25.171 + 99 =
  26. 26.381 + 97 =
  27. 27.386 + 47 =
  28. 28.43 + 27 =
  29. 29.279 + 97 =
  30. 30.222 + 17 =
  31. 31.56 + 77 =
  32. 32.484 + 27 =
  33. 33.144 + 18 =
  34. 34.234 + 98 =
  35. 35.237 + 49 =
  36. 36.490 + 59 =
  37. 37.339 + 17 =
  38. 38.352 + 27 =
  39. 39.57 + 79 =
  40. 40.447 + 48 =

Answer key

  1. 71
  2. 322
  3. 311
  4. 156
  5. 255
  6. 452
  7. 454
  8. 530
  9. 191
  10. 278
  11. 269
  12. 178
  13. 378
  14. 299
  15. 552
  16. 241
  17. 223
  18. 448
  19. 182
  20. 384
  21. 357
  22. 385
  23. 195
  24. 448
  25. 270
  26. 478
  27. 433
  28. 70
  29. 376
  30. 239
  31. 133
  32. 511
  33. 162
  34. 332
  35. 286
  36. 549
  37. 356
  38. 379
  39. 136
  40. 495

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