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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 188 · 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. 1.487 + 38 =
  2. 2.434 + 97 =
  3. 3.350 + 28 =
  4. 4.179 + 67 =
  5. 5.135 + 69 =
  6. 6.342 + 18 =
  7. 7.410 + 19 =
  8. 8.165 + 69 =
  9. 9.313 + 47 =
  10. 10.50 + 79 =
  11. 11.125 + 48 =
  12. 12.155 + 47 =
  13. 13.243 + 87 =
  14. 14.155 + 29 =
  15. 15.161 + 27 =
  16. 16.287 + 69 =
  17. 17.126 + 67 =
  18. 18.476 + 99 =
  19. 19.97 + 67 =
  20. 20.32 + 17 =
  21. 21.127 + 27 =
  22. 22.240 + 77 =
  23. 23.401 + 98 =
  24. 24.54 + 87 =
  25. 25.345 + 59 =
  26. 26.466 + 77 =
  27. 27.471 + 27 =
  28. 28.37 + 19 =
  29. 29.248 + 87 =
  30. 30.119 + 48 =
  31. 31.401 + 18 =
  32. 32.87 + 37 =
  33. 33.294 + 57 =
  34. 34.147 + 48 =
  35. 35.110 + 29 =
  36. 36.153 + 17 =
  37. 37.337 + 97 =
  38. 38.94 + 27 =
  39. 39.262 + 77 =
  40. 40.257 + 19 =

Answer key

  1. 525
  2. 531
  3. 378
  4. 246
  5. 204
  6. 360
  7. 429
  8. 234
  9. 360
  10. 129
  11. 173
  12. 202
  13. 330
  14. 184
  15. 188
  16. 356
  17. 193
  18. 575
  19. 164
  20. 49
  21. 154
  22. 317
  23. 499
  24. 141
  25. 404
  26. 543
  27. 498
  28. 56
  29. 335
  30. 167
  31. 419
  32. 124
  33. 351
  34. 195
  35. 139
  36. 170
  37. 434
  38. 121
  39. 339
  40. 276

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