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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 782 · 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. 1.288 + 77 =
  2. 2.307 + 28 =
  3. 3.32 + 29 =
  4. 4.325 + 17 =
  5. 5.368 + 29 =
  6. 6.349 + 67 =
  7. 7.395 + 77 =
  8. 8.36 + 28 =
  9. 9.48 + 79 =
  10. 10.111 + 99 =
  11. 11.355 + 17 =
  12. 12.356 + 27 =
  13. 13.330 + 28 =
  14. 14.222 + 17 =
  15. 15.418 + 37 =
  16. 16.319 + 69 =
  17. 17.268 + 17 =
  18. 18.288 + 57 =
  19. 19.420 + 29 =
  20. 20.315 + 38 =
  21. 21.312 + 38 =
  22. 22.279 + 97 =
  23. 23.126 + 69 =
  24. 24.105 + 77 =
  25. 25.259 + 68 =
  26. 26.476 + 68 =
  27. 27.224 + 89 =
  28. 28.450 + 47 =
  29. 29.215 + 97 =
  30. 30.102 + 27 =
  31. 31.74 + 59 =
  32. 32.449 + 59 =
  33. 33.85 + 69 =
  34. 34.160 + 18 =
  35. 35.429 + 28 =
  36. 36.483 + 18 =
  37. 37.253 + 57 =
  38. 38.133 + 29 =
  39. 39.191 + 17 =
  40. 40.148 + 38 =

Answer key

  1. 365
  2. 335
  3. 61
  4. 342
  5. 397
  6. 416
  7. 472
  8. 64
  9. 127
  10. 210
  11. 372
  12. 383
  13. 358
  14. 239
  15. 455
  16. 388
  17. 285
  18. 345
  19. 449
  20. 353
  21. 350
  22. 376
  23. 195
  24. 182
  25. 327
  26. 544
  27. 313
  28. 497
  29. 312
  30. 129
  31. 133
  32. 508
  33. 154
  34. 178
  35. 457
  36. 501
  37. 310
  38. 162
  39. 208
  40. 186

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