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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 644 · 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. 1.32 + 48 =
  2. 2.407 + 27 =
  3. 3.120 + 18 =
  4. 4.58 + 78 =
  5. 5.162 + 97 =
  6. 6.61 + 77 =
  7. 7.204 + 48 =
  8. 8.315 + 37 =
  9. 9.286 + 57 =
  10. 10.102 + 17 =
  11. 11.67 + 88 =
  12. 12.471 + 59 =
  13. 13.38 + 29 =
  14. 14.154 + 98 =
  15. 15.339 + 17 =
  16. 16.57 + 17 =
  17. 17.287 + 79 =
  18. 18.444 + 99 =
  19. 19.352 + 98 =
  20. 20.357 + 17 =
  21. 21.398 + 38 =
  22. 22.55 + 77 =
  23. 23.45 + 58 =
  24. 24.299 + 57 =
  25. 25.348 + 69 =
  26. 26.444 + 98 =
  27. 27.35 + 19 =
  28. 28.258 + 48 =
  29. 29.250 + 37 =
  30. 30.382 + 29 =
  31. 31.267 + 98 =
  32. 32.125 + 59 =
  33. 33.138 + 49 =
  34. 34.66 + 67 =
  35. 35.400 + 99 =
  36. 36.252 + 99 =
  37. 37.454 + 18 =
  38. 38.236 + 49 =
  39. 39.26 + 27 =
  40. 40.326 + 28 =

Answer key

  1. 80
  2. 434
  3. 138
  4. 136
  5. 259
  6. 138
  7. 252
  8. 352
  9. 343
  10. 119
  11. 155
  12. 530
  13. 67
  14. 252
  15. 356
  16. 74
  17. 366
  18. 543
  19. 450
  20. 374
  21. 436
  22. 132
  23. 103
  24. 356
  25. 417
  26. 542
  27. 54
  28. 306
  29. 287
  30. 411
  31. 365
  32. 184
  33. 187
  34. 133
  35. 499
  36. 351
  37. 472
  38. 285
  39. 53
  40. 354

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