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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 902 · 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. 1.367 + 28 =
  2. 2.419 + 77 =
  3. 3.146 + 27 =
  4. 4.355 + 47 =
  5. 5.346 + 28 =
  6. 6.232 + 99 =
  7. 7.179 + 38 =
  8. 8.264 + 67 =
  9. 9.281 + 59 =
  10. 10.203 + 69 =
  11. 11.86 + 69 =
  12. 12.156 + 59 =
  13. 13.480 + 97 =
  14. 14.276 + 27 =
  15. 15.207 + 67 =
  16. 16.439 + 87 =
  17. 17.53 + 28 =
  18. 18.113 + 97 =
  19. 19.172 + 27 =
  20. 20.135 + 69 =
  21. 21.171 + 77 =
  22. 22.31 + 28 =
  23. 23.172 + 28 =
  24. 24.97 + 49 =
  25. 25.363 + 38 =
  26. 26.331 + 79 =
  27. 27.334 + 77 =
  28. 28.281 + 88 =
  29. 29.257 + 48 =
  30. 30.125 + 27 =
  31. 31.153 + 49 =
  32. 32.265 + 28 =
  33. 33.265 + 39 =
  34. 34.190 + 88 =
  35. 35.163 + 37 =
  36. 36.330 + 58 =
  37. 37.311 + 97 =
  38. 38.339 + 27 =
  39. 39.283 + 89 =
  40. 40.187 + 99 =

Answer key

  1. 395
  2. 496
  3. 173
  4. 402
  5. 374
  6. 331
  7. 217
  8. 331
  9. 340
  10. 272
  11. 155
  12. 215
  13. 577
  14. 303
  15. 274
  16. 526
  17. 81
  18. 210
  19. 199
  20. 204
  21. 248
  22. 59
  23. 200
  24. 146
  25. 401
  26. 410
  27. 411
  28. 369
  29. 305
  30. 152
  31. 202
  32. 293
  33. 304
  34. 278
  35. 200
  36. 388
  37. 408
  38. 366
  39. 372
  40. 286

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