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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 455 · 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. 1.227 + 99 =
  2. 2.44 + 18 =
  3. 3.249 + 48 =
  4. 4.82 + 37 =
  5. 5.41 + 18 =
  6. 6.148 + 57 =
  7. 7.136 + 79 =
  8. 8.461 + 48 =
  9. 9.422 + 77 =
  10. 10.360 + 99 =
  11. 11.126 + 79 =
  12. 12.454 + 28 =
  13. 13.465 + 19 =
  14. 14.264 + 29 =
  15. 15.418 + 47 =
  16. 16.48 + 28 =
  17. 17.439 + 59 =
  18. 18.58 + 28 =
  19. 19.146 + 58 =
  20. 20.352 + 97 =
  21. 21.50 + 59 =
  22. 22.399 + 39 =
  23. 23.146 + 89 =
  24. 24.483 + 97 =
  25. 25.54 + 78 =
  26. 26.94 + 89 =
  27. 27.169 + 68 =
  28. 28.418 + 27 =
  29. 29.262 + 58 =
  30. 30.221 + 38 =
  31. 31.60 + 59 =
  32. 32.112 + 27 =
  33. 33.292 + 68 =
  34. 34.155 + 58 =
  35. 35.169 + 48 =
  36. 36.239 + 89 =
  37. 37.313 + 17 =
  38. 38.486 + 68 =
  39. 39.319 + 49 =
  40. 40.83 + 68 =

Answer key

  1. 326
  2. 62
  3. 297
  4. 119
  5. 59
  6. 205
  7. 215
  8. 509
  9. 499
  10. 459
  11. 205
  12. 482
  13. 484
  14. 293
  15. 465
  16. 76
  17. 498
  18. 86
  19. 204
  20. 449
  21. 109
  22. 438
  23. 235
  24. 580
  25. 132
  26. 183
  27. 237
  28. 445
  29. 320
  30. 259
  31. 119
  32. 139
  33. 360
  34. 213
  35. 217
  36. 328
  37. 330
  38. 554
  39. 368
  40. 151

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