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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 844 · 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. 1.50 + 17 =
  2. 2.460 + 79 =
  3. 3.205 + 29 =
  4. 4.36 + 78 =
  5. 5.151 + 38 =
  6. 6.234 + 98 =
  7. 7.352 + 79 =
  8. 8.176 + 87 =
  9. 9.483 + 37 =
  10. 10.108 + 47 =
  11. 11.72 + 29 =
  12. 12.337 + 39 =
  13. 13.312 + 77 =
  14. 14.490 + 19 =
  15. 15.250 + 78 =
  16. 16.46 + 17 =
  17. 17.72 + 19 =
  18. 18.237 + 29 =
  19. 19.145 + 78 =
  20. 20.213 + 99 =
  21. 21.122 + 18 =
  22. 22.304 + 77 =
  23. 23.357 + 38 =
  24. 24.212 + 99 =
  25. 25.450 + 77 =
  26. 26.163 + 19 =
  27. 27.184 + 17 =
  28. 28.136 + 79 =
  29. 29.161 + 38 =
  30. 30.170 + 47 =
  31. 31.161 + 39 =
  32. 32.75 + 39 =
  33. 33.55 + 97 =
  34. 34.150 + 99 =
  35. 35.437 + 57 =
  36. 36.375 + 38 =
  37. 37.448 + 88 =
  38. 38.28 + 48 =
  39. 39.436 + 49 =
  40. 40.272 + 79 =

Answer key

  1. 67
  2. 539
  3. 234
  4. 114
  5. 189
  6. 332
  7. 431
  8. 263
  9. 520
  10. 155
  11. 101
  12. 376
  13. 389
  14. 509
  15. 328
  16. 63
  17. 91
  18. 266
  19. 223
  20. 312
  21. 140
  22. 381
  23. 395
  24. 311
  25. 527
  26. 182
  27. 201
  28. 215
  29. 199
  30. 217
  31. 200
  32. 114
  33. 152
  34. 249
  35. 494
  36. 413
  37. 536
  38. 76
  39. 485
  40. 351

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