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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 291 · 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. 1.288 + 49 =
  2. 2.180 + 49 =
  3. 3.422 + 39 =
  4. 4.284 + 57 =
  5. 5.381 + 17 =
  6. 6.79 + 27 =
  7. 7.446 + 67 =
  8. 8.302 + 28 =
  9. 9.248 + 88 =
  10. 10.434 + 38 =
  11. 11.362 + 79 =
  12. 12.431 + 58 =
  13. 13.139 + 79 =
  14. 14.45 + 38 =
  15. 15.430 + 47 =
  16. 16.466 + 17 =
  17. 17.346 + 27 =
  18. 18.350 + 49 =
  19. 19.463 + 67 =
  20. 20.424 + 47 =
  21. 21.306 + 98 =
  22. 22.348 + 97 =
  23. 23.302 + 28 =
  24. 24.245 + 59 =
  25. 25.414 + 38 =
  26. 26.97 + 57 =
  27. 27.207 + 88 =
  28. 28.163 + 87 =
  29. 29.217 + 97 =
  30. 30.61 + 57 =
  31. 31.177 + 99 =
  32. 32.322 + 57 =
  33. 33.141 + 67 =
  34. 34.315 + 27 =
  35. 35.312 + 28 =
  36. 36.94 + 27 =
  37. 37.32 + 59 =
  38. 38.36 + 27 =
  39. 39.441 + 39 =
  40. 40.465 + 27 =

Answer key

  1. 337
  2. 229
  3. 461
  4. 341
  5. 398
  6. 106
  7. 513
  8. 330
  9. 336
  10. 472
  11. 441
  12. 489
  13. 218
  14. 83
  15. 477
  16. 483
  17. 373
  18. 399
  19. 530
  20. 471
  21. 404
  22. 445
  23. 330
  24. 304
  25. 452
  26. 154
  27. 295
  28. 250
  29. 314
  30. 118
  31. 276
  32. 379
  33. 208
  34. 342
  35. 340
  36. 121
  37. 91
  38. 63
  39. 480
  40. 492

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