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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 962 · 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. 1.39 + 19 =
  2. 2.228 + 47 =
  3. 3.64 + 18 =
  4. 4.162 + 97 =
  5. 5.403 + 19 =
  6. 6.158 + 59 =
  7. 7.279 + 98 =
  8. 8.375 + 88 =
  9. 9.29 + 49 =
  10. 10.128 + 59 =
  11. 11.303 + 38 =
  12. 12.58 + 47 =
  13. 13.81 + 57 =
  14. 14.177 + 37 =
  15. 15.396 + 99 =
  16. 16.431 + 59 =
  17. 17.492 + 39 =
  18. 18.387 + 98 =
  19. 19.271 + 48 =
  20. 20.428 + 39 =
  21. 21.215 + 68 =
  22. 22.335 + 27 =
  23. 23.437 + 39 =
  24. 24.457 + 38 =
  25. 25.89 + 68 =
  26. 26.203 + 78 =
  27. 27.447 + 48 =
  28. 28.141 + 88 =
  29. 29.354 + 79 =
  30. 30.446 + 19 =
  31. 31.325 + 98 =
  32. 32.486 + 77 =
  33. 33.346 + 77 =
  34. 34.442 + 38 =
  35. 35.250 + 59 =
  36. 36.401 + 67 =
  37. 37.189 + 18 =
  38. 38.388 + 97 =
  39. 39.392 + 47 =
  40. 40.418 + 39 =

Answer key

  1. 58
  2. 275
  3. 82
  4. 259
  5. 422
  6. 217
  7. 377
  8. 463
  9. 78
  10. 187
  11. 341
  12. 105
  13. 138
  14. 214
  15. 495
  16. 490
  17. 531
  18. 485
  19. 319
  20. 467
  21. 283
  22. 362
  23. 476
  24. 495
  25. 157
  26. 281
  27. 495
  28. 229
  29. 433
  30. 465
  31. 423
  32. 563
  33. 423
  34. 480
  35. 309
  36. 468
  37. 207
  38. 485
  39. 439
  40. 457

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