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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 529 · 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. 1.436 + 49 =
  2. 2.234 + 69 =
  3. 3.277 + 47 =
  4. 4.491 + 77 =
  5. 5.474 + 69 =
  6. 6.128 + 48 =
  7. 7.336 + 59 =
  8. 8.404 + 69 =
  9. 9.80 + 69 =
  10. 10.489 + 28 =
  11. 11.132 + 59 =
  12. 12.205 + 18 =
  13. 13.370 + 37 =
  14. 14.476 + 47 =
  15. 15.182 + 27 =
  16. 16.350 + 57 =
  17. 17.476 + 69 =
  18. 18.277 + 27 =
  19. 19.487 + 89 =
  20. 20.418 + 59 =
  21. 21.396 + 47 =
  22. 22.95 + 88 =
  23. 23.157 + 17 =
  24. 24.41 + 17 =
  25. 25.441 + 87 =
  26. 26.394 + 48 =
  27. 27.410 + 39 =
  28. 28.291 + 27 =
  29. 29.326 + 69 =
  30. 30.187 + 79 =
  31. 31.174 + 98 =
  32. 32.52 + 17 =
  33. 33.274 + 28 =
  34. 34.60 + 57 =
  35. 35.321 + 57 =
  36. 36.464 + 57 =
  37. 37.105 + 49 =
  38. 38.410 + 99 =
  39. 39.225 + 27 =
  40. 40.47 + 49 =

Answer key

  1. 485
  2. 303
  3. 324
  4. 568
  5. 543
  6. 176
  7. 395
  8. 473
  9. 149
  10. 517
  11. 191
  12. 223
  13. 407
  14. 523
  15. 209
  16. 407
  17. 545
  18. 304
  19. 576
  20. 477
  21. 443
  22. 183
  23. 174
  24. 58
  25. 528
  26. 442
  27. 449
  28. 318
  29. 395
  30. 266
  31. 272
  32. 69
  33. 302
  34. 117
  35. 378
  36. 521
  37. 154
  38. 509
  39. 252
  40. 96

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