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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 741 · 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. 1.214 + 19 =
  2. 2.148 + 17 =
  3. 3.417 + 27 =
  4. 4.311 + 38 =
  5. 5.213 + 79 =
  6. 6.197 + 37 =
  7. 7.343 + 78 =
  8. 8.429 + 28 =
  9. 9.121 + 88 =
  10. 10.230 + 37 =
  11. 11.427 + 27 =
  12. 12.234 + 49 =
  13. 13.451 + 37 =
  14. 14.191 + 27 =
  15. 15.127 + 97 =
  16. 16.465 + 47 =
  17. 17.201 + 98 =
  18. 18.97 + 77 =
  19. 19.214 + 27 =
  20. 20.435 + 27 =
  21. 21.368 + 29 =
  22. 22.455 + 17 =
  23. 23.351 + 47 =
  24. 24.330 + 57 =
  25. 25.357 + 49 =
  26. 26.229 + 78 =
  27. 27.80 + 87 =
  28. 28.155 + 39 =
  29. 29.263 + 57 =
  30. 30.66 + 77 =
  31. 31.230 + 78 =
  32. 32.261 + 19 =
  33. 33.376 + 27 =
  34. 34.269 + 69 =
  35. 35.298 + 89 =
  36. 36.222 + 77 =
  37. 37.146 + 19 =
  38. 38.335 + 97 =
  39. 39.381 + 77 =
  40. 40.315 + 17 =

Answer key

  1. 233
  2. 165
  3. 444
  4. 349
  5. 292
  6. 234
  7. 421
  8. 457
  9. 209
  10. 267
  11. 454
  12. 283
  13. 488
  14. 218
  15. 224
  16. 512
  17. 299
  18. 174
  19. 241
  20. 462
  21. 397
  22. 472
  23. 398
  24. 387
  25. 406
  26. 307
  27. 167
  28. 194
  29. 320
  30. 143
  31. 308
  32. 280
  33. 403
  34. 338
  35. 387
  36. 299
  37. 165
  38. 432
  39. 458
  40. 332

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