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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 908 · 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. 1.377 + 39 =
  2. 2.377 + 49 =
  3. 3.25 + 78 =
  4. 4.314 + 47 =
  5. 5.263 + 17 =
  6. 6.73 + 29 =
  7. 7.172 + 19 =
  8. 8.86 + 39 =
  9. 9.113 + 37 =
  10. 10.459 + 98 =
  11. 11.236 + 98 =
  12. 12.73 + 78 =
  13. 13.427 + 38 =
  14. 14.313 + 29 =
  15. 15.62 + 19 =
  16. 16.57 + 47 =
  17. 17.216 + 98 =
  18. 18.470 + 49 =
  19. 19.334 + 57 =
  20. 20.171 + 47 =
  21. 21.75 + 87 =
  22. 22.70 + 68 =
  23. 23.264 + 39 =
  24. 24.214 + 17 =
  25. 25.121 + 88 =
  26. 26.241 + 98 =
  27. 27.314 + 88 =
  28. 28.271 + 77 =
  29. 29.128 + 48 =
  30. 30.303 + 27 =
  31. 31.418 + 47 =
  32. 32.349 + 67 =
  33. 33.318 + 38 =
  34. 34.134 + 78 =
  35. 35.259 + 97 =
  36. 36.112 + 59 =
  37. 37.118 + 18 =
  38. 38.186 + 58 =
  39. 39.223 + 57 =
  40. 40.371 + 97 =

Answer key

  1. 416
  2. 426
  3. 103
  4. 361
  5. 280
  6. 102
  7. 191
  8. 125
  9. 150
  10. 557
  11. 334
  12. 151
  13. 465
  14. 342
  15. 81
  16. 104
  17. 314
  18. 519
  19. 391
  20. 218
  21. 162
  22. 138
  23. 303
  24. 231
  25. 209
  26. 339
  27. 402
  28. 348
  29. 176
  30. 330
  31. 465
  32. 416
  33. 356
  34. 212
  35. 356
  36. 171
  37. 136
  38. 244
  39. 280
  40. 468

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