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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 907 · 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. 1.246 + 97 =
  2. 2.150 + 68 =
  3. 3.310 + 39 =
  4. 4.279 + 28 =
  5. 5.435 + 87 =
  6. 6.37 + 68 =
  7. 7.481 + 29 =
  8. 8.155 + 77 =
  9. 9.336 + 39 =
  10. 10.145 + 48 =
  11. 11.464 + 97 =
  12. 12.87 + 18 =
  13. 13.442 + 38 =
  14. 14.363 + 28 =
  15. 15.289 + 18 =
  16. 16.396 + 87 =
  17. 17.451 + 69 =
  18. 18.356 + 27 =
  19. 19.100 + 58 =
  20. 20.190 + 28 =
  21. 21.78 + 37 =
  22. 22.75 + 38 =
  23. 23.36 + 79 =
  24. 24.118 + 98 =
  25. 25.143 + 49 =
  26. 26.361 + 97 =
  27. 27.111 + 37 =
  28. 28.393 + 48 =
  29. 29.121 + 79 =
  30. 30.249 + 78 =
  31. 31.359 + 69 =
  32. 32.433 + 48 =
  33. 33.310 + 97 =
  34. 34.276 + 48 =
  35. 35.404 + 38 =
  36. 36.153 + 27 =
  37. 37.148 + 89 =
  38. 38.178 + 28 =
  39. 39.70 + 19 =
  40. 40.340 + 29 =

Answer key

  1. 343
  2. 218
  3. 349
  4. 307
  5. 522
  6. 105
  7. 510
  8. 232
  9. 375
  10. 193
  11. 561
  12. 105
  13. 480
  14. 391
  15. 307
  16. 483
  17. 520
  18. 383
  19. 158
  20. 218
  21. 115
  22. 113
  23. 115
  24. 216
  25. 192
  26. 458
  27. 148
  28. 441
  29. 200
  30. 327
  31. 428
  32. 481
  33. 407
  34. 324
  35. 442
  36. 180
  37. 237
  38. 206
  39. 89
  40. 369

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