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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 984 · 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. 1.217 + 77 =
  2. 2.136 + 77 =
  3. 3.454 + 38 =
  4. 4.154 + 77 =
  5. 5.188 + 18 =
  6. 6.118 + 59 =
  7. 7.349 + 38 =
  8. 8.152 + 87 =
  9. 9.310 + 27 =
  10. 10.27 + 47 =
  11. 11.394 + 27 =
  12. 12.213 + 88 =
  13. 13.477 + 17 =
  14. 14.278 + 97 =
  15. 15.46 + 58 =
  16. 16.368 + 49 =
  17. 17.160 + 49 =
  18. 18.354 + 38 =
  19. 19.161 + 19 =
  20. 20.375 + 47 =
  21. 21.82 + 77 =
  22. 22.334 + 57 =
  23. 23.309 + 78 =
  24. 24.38 + 19 =
  25. 25.323 + 27 =
  26. 26.470 + 28 =
  27. 27.314 + 29 =
  28. 28.45 + 39 =
  29. 29.373 + 88 =
  30. 30.421 + 67 =
  31. 31.104 + 97 =
  32. 32.226 + 29 =
  33. 33.439 + 69 =
  34. 34.59 + 88 =
  35. 35.71 + 77 =
  36. 36.59 + 19 =
  37. 37.121 + 48 =
  38. 38.199 + 87 =
  39. 39.464 + 97 =
  40. 40.387 + 88 =

Answer key

  1. 294
  2. 213
  3. 492
  4. 231
  5. 206
  6. 177
  7. 387
  8. 239
  9. 337
  10. 74
  11. 421
  12. 301
  13. 494
  14. 375
  15. 104
  16. 417
  17. 209
  18. 392
  19. 180
  20. 422
  21. 159
  22. 391
  23. 387
  24. 57
  25. 350
  26. 498
  27. 343
  28. 84
  29. 461
  30. 488
  31. 201
  32. 255
  33. 508
  34. 147
  35. 148
  36. 78
  37. 169
  38. 286
  39. 561
  40. 475

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