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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 952 · 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. 1.183 + 48 =
  2. 2.238 + 47 =
  3. 3.234 + 77 =
  4. 4.335 + 57 =
  5. 5.273 + 98 =
  6. 6.87 + 47 =
  7. 7.349 + 57 =
  8. 8.356 + 38 =
  9. 9.472 + 59 =
  10. 10.282 + 98 =
  11. 11.339 + 39 =
  12. 12.342 + 68 =
  13. 13.128 + 87 =
  14. 14.225 + 47 =
  15. 15.41 + 27 =
  16. 16.454 + 77 =
  17. 17.369 + 68 =
  18. 18.153 + 19 =
  19. 19.329 + 38 =
  20. 20.429 + 18 =
  21. 21.454 + 88 =
  22. 22.87 + 97 =
  23. 23.87 + 57 =
  24. 24.141 + 88 =
  25. 25.445 + 38 =
  26. 26.56 + 19 =
  27. 27.364 + 38 =
  28. 28.60 + 79 =
  29. 29.31 + 37 =
  30. 30.472 + 57 =
  31. 31.400 + 78 =
  32. 32.204 + 87 =
  33. 33.117 + 37 =
  34. 34.154 + 39 =
  35. 35.395 + 27 =
  36. 36.251 + 87 =
  37. 37.484 + 88 =
  38. 38.250 + 18 =
  39. 39.358 + 47 =
  40. 40.263 + 38 =

Answer key

  1. 231
  2. 285
  3. 311
  4. 392
  5. 371
  6. 134
  7. 406
  8. 394
  9. 531
  10. 380
  11. 378
  12. 410
  13. 215
  14. 272
  15. 68
  16. 531
  17. 437
  18. 172
  19. 367
  20. 447
  21. 542
  22. 184
  23. 144
  24. 229
  25. 483
  26. 75
  27. 402
  28. 139
  29. 68
  30. 529
  31. 478
  32. 291
  33. 154
  34. 193
  35. 422
  36. 338
  37. 572
  38. 268
  39. 405
  40. 301

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