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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 857 · 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. 1.483 + 58 =
  2. 2.130 + 57 =
  3. 3.231 + 17 =
  4. 4.300 + 59 =
  5. 5.440 + 67 =
  6. 6.400 + 78 =
  7. 7.466 + 78 =
  8. 8.432 + 87 =
  9. 9.344 + 18 =
  10. 10.163 + 37 =
  11. 11.153 + 99 =
  12. 12.463 + 28 =
  13. 13.199 + 38 =
  14. 14.227 + 49 =
  15. 15.176 + 19 =
  16. 16.95 + 58 =
  17. 17.102 + 87 =
  18. 18.52 + 48 =
  19. 19.380 + 48 =
  20. 20.121 + 78 =
  21. 21.351 + 17 =
  22. 22.229 + 49 =
  23. 23.345 + 38 =
  24. 24.105 + 38 =
  25. 25.329 + 27 =
  26. 26.172 + 27 =
  27. 27.467 + 77 =
  28. 28.353 + 39 =
  29. 29.136 + 19 =
  30. 30.466 + 88 =
  31. 31.494 + 48 =
  32. 32.228 + 28 =
  33. 33.89 + 49 =
  34. 34.234 + 28 =
  35. 35.297 + 39 =
  36. 36.79 + 39 =
  37. 37.274 + 19 =
  38. 38.45 + 69 =
  39. 39.220 + 58 =
  40. 40.109 + 79 =

Answer key

  1. 541
  2. 187
  3. 248
  4. 359
  5. 507
  6. 478
  7. 544
  8. 519
  9. 362
  10. 200
  11. 252
  12. 491
  13. 237
  14. 276
  15. 195
  16. 153
  17. 189
  18. 100
  19. 428
  20. 199
  21. 368
  22. 278
  23. 383
  24. 143
  25. 356
  26. 199
  27. 544
  28. 392
  29. 155
  30. 554
  31. 542
  32. 256
  33. 138
  34. 262
  35. 336
  36. 118
  37. 293
  38. 114
  39. 278
  40. 188

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