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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 691 · 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. 1.110 + 27 =
  2. 2.222 + 87 =
  3. 3.198 + 97 =
  4. 4.373 + 49 =
  5. 5.219 + 67 =
  6. 6.171 + 99 =
  7. 7.398 + 67 =
  8. 8.187 + 19 =
  9. 9.376 + 99 =
  10. 10.270 + 37 =
  11. 11.250 + 69 =
  12. 12.87 + 27 =
  13. 13.411 + 97 =
  14. 14.239 + 49 =
  15. 15.425 + 78 =
  16. 16.123 + 59 =
  17. 17.367 + 27 =
  18. 18.218 + 87 =
  19. 19.229 + 78 =
  20. 20.472 + 49 =
  21. 21.410 + 78 =
  22. 22.244 + 67 =
  23. 23.478 + 67 =
  24. 24.453 + 18 =
  25. 25.62 + 77 =
  26. 26.249 + 37 =
  27. 27.321 + 29 =
  28. 28.42 + 28 =
  29. 29.47 + 39 =
  30. 30.361 + 77 =
  31. 31.257 + 48 =
  32. 32.359 + 88 =
  33. 33.204 + 19 =
  34. 34.58 + 99 =
  35. 35.222 + 29 =
  36. 36.311 + 97 =
  37. 37.139 + 59 =
  38. 38.265 + 79 =
  39. 39.225 + 28 =
  40. 40.107 + 48 =

Answer key

  1. 137
  2. 309
  3. 295
  4. 422
  5. 286
  6. 270
  7. 465
  8. 206
  9. 475
  10. 307
  11. 319
  12. 114
  13. 508
  14. 288
  15. 503
  16. 182
  17. 394
  18. 305
  19. 307
  20. 521
  21. 488
  22. 311
  23. 545
  24. 471
  25. 139
  26. 286
  27. 350
  28. 70
  29. 86
  30. 438
  31. 305
  32. 447
  33. 223
  34. 157
  35. 251
  36. 408
  37. 198
  38. 344
  39. 253
  40. 155

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