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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 256 · 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. 1.409 + 18 =
  2. 2.426 + 88 =
  3. 3.351 + 87 =
  4. 4.362 + 48 =
  5. 5.124 + 87 =
  6. 6.405 + 49 =
  7. 7.159 + 29 =
  8. 8.260 + 37 =
  9. 9.368 + 27 =
  10. 10.204 + 38 =
  11. 11.270 + 87 =
  12. 12.109 + 28 =
  13. 13.438 + 29 =
  14. 14.462 + 17 =
  15. 15.149 + 27 =
  16. 16.417 + 29 =
  17. 17.52 + 68 =
  18. 18.307 + 57 =
  19. 19.495 + 39 =
  20. 20.91 + 59 =
  21. 21.405 + 69 =
  22. 22.148 + 67 =
  23. 23.464 + 88 =
  24. 24.199 + 58 =
  25. 25.467 + 27 =
  26. 26.303 + 17 =
  27. 27.204 + 27 =
  28. 28.284 + 39 =
  29. 29.440 + 78 =
  30. 30.376 + 89 =
  31. 31.438 + 99 =
  32. 32.350 + 28 =
  33. 33.349 + 97 =
  34. 34.277 + 68 =
  35. 35.320 + 59 =
  36. 36.81 + 67 =
  37. 37.111 + 58 =
  38. 38.263 + 89 =
  39. 39.375 + 88 =
  40. 40.426 + 47 =

Answer key

  1. 427
  2. 514
  3. 438
  4. 410
  5. 211
  6. 454
  7. 188
  8. 297
  9. 395
  10. 242
  11. 357
  12. 137
  13. 467
  14. 479
  15. 176
  16. 446
  17. 120
  18. 364
  19. 534
  20. 150
  21. 474
  22. 215
  23. 552
  24. 257
  25. 494
  26. 320
  27. 231
  28. 323
  29. 518
  30. 465
  31. 537
  32. 378
  33. 446
  34. 345
  35. 379
  36. 148
  37. 169
  38. 352
  39. 463
  40. 473

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