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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 868 · 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. 1.485 + 29 =
  2. 2.320 + 49 =
  3. 3.364 + 59 =
  4. 4.173 + 48 =
  5. 5.153 + 89 =
  6. 6.414 + 49 =
  7. 7.309 + 87 =
  8. 8.238 + 17 =
  9. 9.53 + 58 =
  10. 10.92 + 97 =
  11. 11.217 + 88 =
  12. 12.222 + 58 =
  13. 13.117 + 77 =
  14. 14.299 + 17 =
  15. 15.143 + 99 =
  16. 16.329 + 38 =
  17. 17.77 + 99 =
  18. 18.356 + 28 =
  19. 19.411 + 69 =
  20. 20.32 + 19 =
  21. 21.27 + 27 =
  22. 22.30 + 67 =
  23. 23.45 + 17 =
  24. 24.364 + 37 =
  25. 25.159 + 38 =
  26. 26.269 + 39 =
  27. 27.168 + 18 =
  28. 28.27 + 87 =
  29. 29.244 + 17 =
  30. 30.64 + 88 =
  31. 31.188 + 17 =
  32. 32.90 + 89 =
  33. 33.416 + 98 =
  34. 34.49 + 69 =
  35. 35.345 + 47 =
  36. 36.407 + 87 =
  37. 37.139 + 79 =
  38. 38.208 + 48 =
  39. 39.361 + 48 =
  40. 40.60 + 17 =

Answer key

  1. 514
  2. 369
  3. 423
  4. 221
  5. 242
  6. 463
  7. 396
  8. 255
  9. 111
  10. 189
  11. 305
  12. 280
  13. 194
  14. 316
  15. 242
  16. 367
  17. 176
  18. 384
  19. 480
  20. 51
  21. 54
  22. 97
  23. 62
  24. 401
  25. 197
  26. 308
  27. 186
  28. 114
  29. 261
  30. 152
  31. 205
  32. 179
  33. 514
  34. 118
  35. 392
  36. 494
  37. 218
  38. 256
  39. 409
  40. 77

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