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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 972 · 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. 1.420 + 28 =
  2. 2.498 + 57 =
  3. 3.86 + 79 =
  4. 4.409 + 88 =
  5. 5.167 + 99 =
  6. 6.193 + 39 =
  7. 7.246 + 97 =
  8. 8.301 + 47 =
  9. 9.56 + 69 =
  10. 10.384 + 29 =
  11. 11.283 + 87 =
  12. 12.269 + 79 =
  13. 13.118 + 28 =
  14. 14.214 + 77 =
  15. 15.96 + 49 =
  16. 16.372 + 59 =
  17. 17.81 + 59 =
  18. 18.437 + 88 =
  19. 19.337 + 58 =
  20. 20.143 + 97 =
  21. 21.354 + 28 =
  22. 22.68 + 27 =
  23. 23.200 + 99 =
  24. 24.132 + 18 =
  25. 25.56 + 59 =
  26. 26.37 + 98 =
  27. 27.58 + 27 =
  28. 28.201 + 97 =
  29. 29.278 + 28 =
  30. 30.335 + 99 =
  31. 31.138 + 19 =
  32. 32.105 + 19 =
  33. 33.204 + 77 =
  34. 34.136 + 77 =
  35. 35.417 + 28 =
  36. 36.170 + 29 =
  37. 37.438 + 29 =
  38. 38.472 + 89 =
  39. 39.47 + 88 =
  40. 40.405 + 18 =

Answer key

  1. 448
  2. 555
  3. 165
  4. 497
  5. 266
  6. 232
  7. 343
  8. 348
  9. 125
  10. 413
  11. 370
  12. 348
  13. 146
  14. 291
  15. 145
  16. 431
  17. 140
  18. 525
  19. 395
  20. 240
  21. 382
  22. 95
  23. 299
  24. 150
  25. 115
  26. 135
  27. 85
  28. 298
  29. 306
  30. 434
  31. 157
  32. 124
  33. 281
  34. 213
  35. 445
  36. 199
  37. 467
  38. 561
  39. 135
  40. 423

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