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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 515 · 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. 1.80 + 37 =
  2. 2.274 + 87 =
  3. 3.400 + 38 =
  4. 4.317 + 79 =
  5. 5.201 + 99 =
  6. 6.249 + 69 =
  7. 7.25 + 78 =
  8. 8.130 + 47 =
  9. 9.122 + 69 =
  10. 10.136 + 47 =
  11. 11.298 + 18 =
  12. 12.61 + 68 =
  13. 13.489 + 58 =
  14. 14.105 + 49 =
  15. 15.114 + 38 =
  16. 16.208 + 49 =
  17. 17.96 + 87 =
  18. 18.489 + 87 =
  19. 19.205 + 18 =
  20. 20.396 + 18 =
  21. 21.479 + 48 =
  22. 22.379 + 39 =
  23. 23.213 + 17 =
  24. 24.315 + 19 =
  25. 25.103 + 99 =
  26. 26.481 + 87 =
  27. 27.450 + 29 =
  28. 28.125 + 68 =
  29. 29.82 + 17 =
  30. 30.143 + 88 =
  31. 31.86 + 87 =
  32. 32.110 + 28 =
  33. 33.77 + 39 =
  34. 34.113 + 58 =
  35. 35.435 + 88 =
  36. 36.386 + 68 =
  37. 37.41 + 68 =
  38. 38.491 + 87 =
  39. 39.122 + 58 =
  40. 40.155 + 27 =

Answer key

  1. 117
  2. 361
  3. 438
  4. 396
  5. 300
  6. 318
  7. 103
  8. 177
  9. 191
  10. 183
  11. 316
  12. 129
  13. 547
  14. 154
  15. 152
  16. 257
  17. 183
  18. 576
  19. 223
  20. 414
  21. 527
  22. 418
  23. 230
  24. 334
  25. 202
  26. 568
  27. 479
  28. 193
  29. 99
  30. 231
  31. 173
  32. 138
  33. 116
  34. 171
  35. 523
  36. 454
  37. 109
  38. 578
  39. 180
  40. 182

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