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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 121 · 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. 1.380 + 98 =
  2. 2.442 + 47 =
  3. 3.87 + 97 =
  4. 4.376 + 29 =
  5. 5.37 + 47 =
  6. 6.241 + 59 =
  7. 7.153 + 28 =
  8. 8.284 + 48 =
  9. 9.128 + 18 =
  10. 10.496 + 19 =
  11. 11.40 + 59 =
  12. 12.186 + 48 =
  13. 13.443 + 57 =
  14. 14.211 + 38 =
  15. 15.57 + 99 =
  16. 16.470 + 88 =
  17. 17.107 + 39 =
  18. 18.378 + 78 =
  19. 19.427 + 79 =
  20. 20.108 + 49 =
  21. 21.131 + 17 =
  22. 22.84 + 37 =
  23. 23.132 + 37 =
  24. 24.455 + 18 =
  25. 25.431 + 89 =
  26. 26.296 + 78 =
  27. 27.394 + 87 =
  28. 28.414 + 87 =
  29. 29.414 + 98 =
  30. 30.201 + 68 =
  31. 31.478 + 69 =
  32. 32.491 + 47 =
  33. 33.236 + 69 =
  34. 34.287 + 48 =
  35. 35.80 + 97 =
  36. 36.343 + 49 =
  37. 37.450 + 19 =
  38. 38.309 + 58 =
  39. 39.342 + 49 =
  40. 40.37 + 29 =

Answer key

  1. 478
  2. 489
  3. 184
  4. 405
  5. 84
  6. 300
  7. 181
  8. 332
  9. 146
  10. 515
  11. 99
  12. 234
  13. 500
  14. 249
  15. 156
  16. 558
  17. 146
  18. 456
  19. 506
  20. 157
  21. 148
  22. 121
  23. 169
  24. 473
  25. 520
  26. 374
  27. 481
  28. 501
  29. 512
  30. 269
  31. 547
  32. 538
  33. 305
  34. 335
  35. 177
  36. 392
  37. 469
  38. 367
  39. 391
  40. 66

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