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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 275 · 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. 1.267 + 49 =
  2. 2.429 + 18 =
  3. 3.398 + 18 =
  4. 4.209 + 39 =
  5. 5.462 + 57 =
  6. 6.287 + 97 =
  7. 7.138 + 98 =
  8. 8.341 + 47 =
  9. 9.477 + 78 =
  10. 10.406 + 78 =
  11. 11.241 + 48 =
  12. 12.367 + 38 =
  13. 13.243 + 37 =
  14. 14.348 + 47 =
  15. 15.199 + 28 =
  16. 16.108 + 19 =
  17. 17.104 + 98 =
  18. 18.330 + 89 =
  19. 19.120 + 39 =
  20. 20.36 + 47 =
  21. 21.245 + 87 =
  22. 22.262 + 99 =
  23. 23.213 + 28 =
  24. 24.105 + 57 =
  25. 25.385 + 67 =
  26. 26.355 + 98 =
  27. 27.274 + 48 =
  28. 28.199 + 39 =
  29. 29.155 + 27 =
  30. 30.472 + 27 =
  31. 31.164 + 78 =
  32. 32.399 + 77 =
  33. 33.136 + 17 =
  34. 34.419 + 17 =
  35. 35.141 + 98 =
  36. 36.452 + 18 =
  37. 37.222 + 78 =
  38. 38.485 + 59 =
  39. 39.248 + 88 =
  40. 40.374 + 28 =

Answer key

  1. 316
  2. 447
  3. 416
  4. 248
  5. 519
  6. 384
  7. 236
  8. 388
  9. 555
  10. 484
  11. 289
  12. 405
  13. 280
  14. 395
  15. 227
  16. 127
  17. 202
  18. 419
  19. 159
  20. 83
  21. 332
  22. 361
  23. 241
  24. 162
  25. 452
  26. 453
  27. 322
  28. 238
  29. 182
  30. 499
  31. 242
  32. 476
  33. 153
  34. 436
  35. 239
  36. 470
  37. 300
  38. 544
  39. 336
  40. 402

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