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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 839 · 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. 1.30 + 28 =
  2. 2.115 + 97 =
  3. 3.31 + 67 =
  4. 4.160 + 89 =
  5. 5.68 + 17 =
  6. 6.70 + 99 =
  7. 7.335 + 97 =
  8. 8.367 + 38 =
  9. 9.348 + 98 =
  10. 10.160 + 78 =
  11. 11.78 + 57 =
  12. 12.314 + 99 =
  13. 13.113 + 58 =
  14. 14.95 + 99 =
  15. 15.457 + 49 =
  16. 16.358 + 18 =
  17. 17.75 + 48 =
  18. 18.296 + 27 =
  19. 19.350 + 58 =
  20. 20.25 + 39 =
  21. 21.170 + 77 =
  22. 22.137 + 29 =
  23. 23.194 + 29 =
  24. 24.355 + 29 =
  25. 25.453 + 48 =
  26. 26.408 + 87 =
  27. 27.236 + 58 =
  28. 28.102 + 47 =
  29. 29.31 + 57 =
  30. 30.102 + 77 =
  31. 31.160 + 79 =
  32. 32.370 + 18 =
  33. 33.261 + 28 =
  34. 34.86 + 47 =
  35. 35.298 + 67 =
  36. 36.335 + 88 =
  37. 37.196 + 87 =
  38. 38.244 + 37 =
  39. 39.344 + 78 =
  40. 40.161 + 48 =

Answer key

  1. 58
  2. 212
  3. 98
  4. 249
  5. 85
  6. 169
  7. 432
  8. 405
  9. 446
  10. 238
  11. 135
  12. 413
  13. 171
  14. 194
  15. 506
  16. 376
  17. 123
  18. 323
  19. 408
  20. 64
  21. 247
  22. 166
  23. 223
  24. 384
  25. 501
  26. 495
  27. 294
  28. 149
  29. 88
  30. 179
  31. 239
  32. 388
  33. 289
  34. 133
  35. 365
  36. 423
  37. 283
  38. 281
  39. 422
  40. 209

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