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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 988 · 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. 1.467 + 97 =
  2. 2.46 + 17 =
  3. 3.108 + 67 =
  4. 4.57 + 38 =
  5. 5.395 + 68 =
  6. 6.493 + 87 =
  7. 7.289 + 27 =
  8. 8.179 + 98 =
  9. 9.115 + 17 =
  10. 10.263 + 48 =
  11. 11.385 + 17 =
  12. 12.141 + 48 =
  13. 13.155 + 77 =
  14. 14.55 + 69 =
  15. 15.98 + 47 =
  16. 16.52 + 17 =
  17. 17.314 + 47 =
  18. 18.336 + 78 =
  19. 19.276 + 17 =
  20. 20.70 + 38 =
  21. 21.303 + 28 =
  22. 22.250 + 39 =
  23. 23.210 + 48 =
  24. 24.431 + 87 =
  25. 25.464 + 69 =
  26. 26.367 + 37 =
  27. 27.224 + 99 =
  28. 28.46 + 88 =
  29. 29.278 + 57 =
  30. 30.143 + 37 =
  31. 31.393 + 89 =
  32. 32.465 + 59 =
  33. 33.284 + 97 =
  34. 34.432 + 49 =
  35. 35.184 + 57 =
  36. 36.421 + 18 =
  37. 37.198 + 47 =
  38. 38.216 + 17 =
  39. 39.27 + 79 =
  40. 40.420 + 37 =

Answer key

  1. 564
  2. 63
  3. 175
  4. 95
  5. 463
  6. 580
  7. 316
  8. 277
  9. 132
  10. 311
  11. 402
  12. 189
  13. 232
  14. 124
  15. 145
  16. 69
  17. 361
  18. 414
  19. 293
  20. 108
  21. 331
  22. 289
  23. 258
  24. 518
  25. 533
  26. 404
  27. 323
  28. 134
  29. 335
  30. 180
  31. 482
  32. 524
  33. 381
  34. 481
  35. 241
  36. 439
  37. 245
  38. 233
  39. 106
  40. 457

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