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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 148 · 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. 1.200 + 18 =
  2. 2.357 + 47 =
  3. 3.311 + 99 =
  4. 4.165 + 39 =
  5. 5.76 + 59 =
  6. 6.199 + 19 =
  7. 7.499 + 97 =
  8. 8.450 + 37 =
  9. 9.235 + 18 =
  10. 10.57 + 37 =
  11. 11.357 + 49 =
  12. 12.141 + 77 =
  13. 13.300 + 88 =
  14. 14.342 + 57 =
  15. 15.174 + 97 =
  16. 16.338 + 59 =
  17. 17.47 + 77 =
  18. 18.359 + 28 =
  19. 19.118 + 19 =
  20. 20.459 + 69 =
  21. 21.219 + 98 =
  22. 22.81 + 79 =
  23. 23.462 + 79 =
  24. 24.339 + 99 =
  25. 25.476 + 99 =
  26. 26.389 + 99 =
  27. 27.276 + 57 =
  28. 28.317 + 87 =
  29. 29.300 + 59 =
  30. 30.127 + 38 =
  31. 31.136 + 67 =
  32. 32.350 + 67 =
  33. 33.162 + 79 =
  34. 34.38 + 79 =
  35. 35.405 + 27 =
  36. 36.32 + 79 =
  37. 37.399 + 89 =
  38. 38.364 + 19 =
  39. 39.60 + 37 =
  40. 40.354 + 97 =

Answer key

  1. 218
  2. 404
  3. 410
  4. 204
  5. 135
  6. 218
  7. 596
  8. 487
  9. 253
  10. 94
  11. 406
  12. 218
  13. 388
  14. 399
  15. 271
  16. 397
  17. 124
  18. 387
  19. 137
  20. 528
  21. 317
  22. 160
  23. 541
  24. 438
  25. 575
  26. 488
  27. 333
  28. 404
  29. 359
  30. 165
  31. 203
  32. 417
  33. 241
  34. 117
  35. 432
  36. 111
  37. 488
  38. 383
  39. 97
  40. 451

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