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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 986 · 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. 1.122 + 69 =
  2. 2.343 + 68 =
  3. 3.139 + 69 =
  4. 4.66 + 58 =
  5. 5.364 + 59 =
  6. 6.353 + 69 =
  7. 7.83 + 28 =
  8. 8.406 + 97 =
  9. 9.279 + 37 =
  10. 10.89 + 29 =
  11. 11.129 + 79 =
  12. 12.136 + 88 =
  13. 13.184 + 39 =
  14. 14.311 + 79 =
  15. 15.38 + 79 =
  16. 16.324 + 17 =
  17. 17.425 + 57 =
  18. 18.452 + 48 =
  19. 19.163 + 88 =
  20. 20.275 + 17 =
  21. 21.207 + 19 =
  22. 22.98 + 49 =
  23. 23.72 + 38 =
  24. 24.375 + 97 =
  25. 25.389 + 67 =
  26. 26.343 + 89 =
  27. 27.490 + 57 =
  28. 28.414 + 27 =
  29. 29.145 + 77 =
  30. 30.116 + 27 =
  31. 31.458 + 48 =
  32. 32.391 + 69 =
  33. 33.408 + 39 =
  34. 34.410 + 79 =
  35. 35.188 + 49 =
  36. 36.65 + 77 =
  37. 37.415 + 47 =
  38. 38.239 + 88 =
  39. 39.127 + 27 =
  40. 40.438 + 17 =

Answer key

  1. 191
  2. 411
  3. 208
  4. 124
  5. 423
  6. 422
  7. 111
  8. 503
  9. 316
  10. 118
  11. 208
  12. 224
  13. 223
  14. 390
  15. 117
  16. 341
  17. 482
  18. 500
  19. 251
  20. 292
  21. 226
  22. 147
  23. 110
  24. 472
  25. 456
  26. 432
  27. 547
  28. 441
  29. 222
  30. 143
  31. 506
  32. 460
  33. 447
  34. 489
  35. 237
  36. 142
  37. 462
  38. 327
  39. 154
  40. 455

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