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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 923 · 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. 1.198 + 99 =
  2. 2.320 + 28 =
  3. 3.135 + 97 =
  4. 4.282 + 49 =
  5. 5.115 + 67 =
  6. 6.150 + 47 =
  7. 7.323 + 28 =
  8. 8.45 + 68 =
  9. 9.234 + 87 =
  10. 10.308 + 37 =
  11. 11.118 + 69 =
  12. 12.475 + 39 =
  13. 13.353 + 58 =
  14. 14.311 + 38 =
  15. 15.243 + 48 =
  16. 16.40 + 38 =
  17. 17.305 + 37 =
  18. 18.359 + 87 =
  19. 19.475 + 39 =
  20. 20.72 + 49 =
  21. 21.303 + 68 =
  22. 22.164 + 17 =
  23. 23.250 + 77 =
  24. 24.64 + 48 =
  25. 25.423 + 38 =
  26. 26.85 + 89 =
  27. 27.303 + 89 =
  28. 28.84 + 57 =
  29. 29.417 + 87 =
  30. 30.441 + 99 =
  31. 31.449 + 88 =
  32. 32.268 + 69 =
  33. 33.415 + 68 =
  34. 34.382 + 99 =
  35. 35.428 + 78 =
  36. 36.89 + 68 =
  37. 37.354 + 79 =
  38. 38.350 + 17 =
  39. 39.480 + 39 =
  40. 40.62 + 79 =

Answer key

  1. 297
  2. 348
  3. 232
  4. 331
  5. 182
  6. 197
  7. 351
  8. 113
  9. 321
  10. 345
  11. 187
  12. 514
  13. 411
  14. 349
  15. 291
  16. 78
  17. 342
  18. 446
  19. 514
  20. 121
  21. 371
  22. 181
  23. 327
  24. 112
  25. 461
  26. 174
  27. 392
  28. 141
  29. 504
  30. 540
  31. 537
  32. 337
  33. 483
  34. 481
  35. 506
  36. 157
  37. 433
  38. 367
  39. 519
  40. 141

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