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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 841 · 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. 1.32 + 77 =
  2. 2.149 + 37 =
  3. 3.371 + 78 =
  4. 4.172 + 79 =
  5. 5.58 + 37 =
  6. 6.498 + 37 =
  7. 7.427 + 19 =
  8. 8.258 + 38 =
  9. 9.276 + 87 =
  10. 10.325 + 49 =
  11. 11.385 + 99 =
  12. 12.319 + 99 =
  13. 13.255 + 28 =
  14. 14.424 + 67 =
  15. 15.59 + 27 =
  16. 16.225 + 98 =
  17. 17.432 + 28 =
  18. 18.298 + 27 =
  19. 19.484 + 77 =
  20. 20.212 + 19 =
  21. 21.372 + 79 =
  22. 22.116 + 59 =
  23. 23.155 + 89 =
  24. 24.372 + 17 =
  25. 25.215 + 28 =
  26. 26.99 + 87 =
  27. 27.441 + 97 =
  28. 28.191 + 49 =
  29. 29.363 + 28 =
  30. 30.269 + 27 =
  31. 31.420 + 48 =
  32. 32.49 + 77 =
  33. 33.308 + 19 =
  34. 34.344 + 58 =
  35. 35.347 + 88 =
  36. 36.155 + 69 =
  37. 37.96 + 99 =
  38. 38.354 + 39 =
  39. 39.423 + 49 =
  40. 40.380 + 17 =

Answer key

  1. 109
  2. 186
  3. 449
  4. 251
  5. 95
  6. 535
  7. 446
  8. 296
  9. 363
  10. 374
  11. 484
  12. 418
  13. 283
  14. 491
  15. 86
  16. 323
  17. 460
  18. 325
  19. 561
  20. 231
  21. 451
  22. 175
  23. 244
  24. 389
  25. 243
  26. 186
  27. 538
  28. 240
  29. 391
  30. 296
  31. 468
  32. 126
  33. 327
  34. 402
  35. 435
  36. 224
  37. 195
  38. 393
  39. 472
  40. 397

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