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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 874 · 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. 1.130 + 68 =
  2. 2.122 + 27 =
  3. 3.220 + 79 =
  4. 4.46 + 39 =
  5. 5.495 + 57 =
  6. 6.148 + 49 =
  7. 7.476 + 48 =
  8. 8.488 + 37 =
  9. 9.135 + 78 =
  10. 10.136 + 59 =
  11. 11.115 + 78 =
  12. 12.366 + 98 =
  13. 13.153 + 19 =
  14. 14.131 + 79 =
  15. 15.428 + 38 =
  16. 16.380 + 97 =
  17. 17.269 + 28 =
  18. 18.147 + 19 =
  19. 19.282 + 27 =
  20. 20.250 + 98 =
  21. 21.38 + 87 =
  22. 22.184 + 97 =
  23. 23.197 + 49 =
  24. 24.256 + 38 =
  25. 25.138 + 68 =
  26. 26.66 + 27 =
  27. 27.131 + 67 =
  28. 28.36 + 48 =
  29. 29.332 + 18 =
  30. 30.444 + 67 =
  31. 31.146 + 69 =
  32. 32.394 + 99 =
  33. 33.98 + 27 =
  34. 34.119 + 19 =
  35. 35.336 + 19 =
  36. 36.473 + 58 =
  37. 37.91 + 17 =
  38. 38.469 + 99 =
  39. 39.483 + 18 =
  40. 40.35 + 59 =

Answer key

  1. 198
  2. 149
  3. 299
  4. 85
  5. 552
  6. 197
  7. 524
  8. 525
  9. 213
  10. 195
  11. 193
  12. 464
  13. 172
  14. 210
  15. 466
  16. 477
  17. 297
  18. 166
  19. 309
  20. 348
  21. 125
  22. 281
  23. 246
  24. 294
  25. 206
  26. 93
  27. 198
  28. 84
  29. 350
  30. 511
  31. 215
  32. 493
  33. 125
  34. 138
  35. 355
  36. 531
  37. 108
  38. 568
  39. 501
  40. 94

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