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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 975 · 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. 1.56 + 98 =
  2. 2.325 + 47 =
  3. 3.373 + 48 =
  4. 4.122 + 58 =
  5. 5.166 + 37 =
  6. 6.143 + 29 =
  7. 7.118 + 99 =
  8. 8.431 + 58 =
  9. 9.211 + 77 =
  10. 10.311 + 87 =
  11. 11.76 + 78 =
  12. 12.329 + 69 =
  13. 13.132 + 27 =
  14. 14.69 + 47 =
  15. 15.251 + 97 =
  16. 16.286 + 37 =
  17. 17.453 + 88 =
  18. 18.138 + 17 =
  19. 19.150 + 99 =
  20. 20.32 + 17 =
  21. 21.259 + 98 =
  22. 22.152 + 47 =
  23. 23.140 + 47 =
  24. 24.392 + 47 =
  25. 25.465 + 38 =
  26. 26.391 + 99 =
  27. 27.144 + 29 =
  28. 28.180 + 19 =
  29. 29.154 + 39 =
  30. 30.213 + 97 =
  31. 31.263 + 79 =
  32. 32.327 + 78 =
  33. 33.479 + 29 =
  34. 34.439 + 17 =
  35. 35.286 + 47 =
  36. 36.341 + 17 =
  37. 37.311 + 78 =
  38. 38.357 + 49 =
  39. 39.190 + 89 =
  40. 40.83 + 29 =

Answer key

  1. 154
  2. 372
  3. 421
  4. 180
  5. 203
  6. 172
  7. 217
  8. 489
  9. 288
  10. 398
  11. 154
  12. 398
  13. 159
  14. 116
  15. 348
  16. 323
  17. 541
  18. 155
  19. 249
  20. 49
  21. 357
  22. 199
  23. 187
  24. 439
  25. 503
  26. 490
  27. 173
  28. 199
  29. 193
  30. 310
  31. 342
  32. 405
  33. 508
  34. 456
  35. 333
  36. 358
  37. 389
  38. 406
  39. 279
  40. 112

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