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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 891 · 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. 1.112 + 77 =
  2. 2.224 + 47 =
  3. 3.260 + 29 =
  4. 4.444 + 89 =
  5. 5.121 + 48 =
  6. 6.115 + 78 =
  7. 7.350 + 29 =
  8. 8.192 + 89 =
  9. 9.112 + 39 =
  10. 10.85 + 68 =
  11. 11.394 + 19 =
  12. 12.32 + 18 =
  13. 13.450 + 29 =
  14. 14.332 + 67 =
  15. 15.328 + 47 =
  16. 16.419 + 47 =
  17. 17.305 + 98 =
  18. 18.315 + 29 =
  19. 19.388 + 89 =
  20. 20.74 + 58 =
  21. 21.122 + 39 =
  22. 22.459 + 79 =
  23. 23.55 + 19 =
  24. 24.154 + 47 =
  25. 25.239 + 27 =
  26. 26.230 + 28 =
  27. 27.328 + 48 =
  28. 28.68 + 47 =
  29. 29.150 + 89 =
  30. 30.181 + 17 =
  31. 31.263 + 37 =
  32. 32.362 + 77 =
  33. 33.191 + 69 =
  34. 34.343 + 99 =
  35. 35.159 + 98 =
  36. 36.105 + 87 =
  37. 37.252 + 68 =
  38. 38.94 + 57 =
  39. 39.345 + 39 =
  40. 40.468 + 59 =

Answer key

  1. 189
  2. 271
  3. 289
  4. 533
  5. 169
  6. 193
  7. 379
  8. 281
  9. 151
  10. 153
  11. 413
  12. 50
  13. 479
  14. 399
  15. 375
  16. 466
  17. 403
  18. 344
  19. 477
  20. 132
  21. 161
  22. 538
  23. 74
  24. 201
  25. 266
  26. 258
  27. 376
  28. 115
  29. 239
  30. 198
  31. 300
  32. 439
  33. 260
  34. 442
  35. 257
  36. 192
  37. 320
  38. 151
  39. 384
  40. 527

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