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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 833 · 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. 1.104 + 77 =
  2. 2.111 + 47 =
  3. 3.89 + 79 =
  4. 4.304 + 57 =
  5. 5.180 + 98 =
  6. 6.44 + 59 =
  7. 7.431 + 39 =
  8. 8.33 + 28 =
  9. 9.348 + 59 =
  10. 10.114 + 39 =
  11. 11.155 + 78 =
  12. 12.219 + 37 =
  13. 13.216 + 37 =
  14. 14.415 + 18 =
  15. 15.254 + 98 =
  16. 16.82 + 28 =
  17. 17.420 + 67 =
  18. 18.30 + 27 =
  19. 19.78 + 98 =
  20. 20.224 + 67 =
  21. 21.359 + 28 =
  22. 22.428 + 77 =
  23. 23.197 + 49 =
  24. 24.91 + 77 =
  25. 25.220 + 97 =
  26. 26.194 + 98 =
  27. 27.383 + 58 =
  28. 28.61 + 47 =
  29. 29.494 + 57 =
  30. 30.326 + 48 =
  31. 31.213 + 97 =
  32. 32.118 + 58 =
  33. 33.194 + 38 =
  34. 34.480 + 99 =
  35. 35.412 + 87 =
  36. 36.290 + 58 =
  37. 37.129 + 17 =
  38. 38.392 + 19 =
  39. 39.208 + 17 =
  40. 40.127 + 57 =

Answer key

  1. 181
  2. 158
  3. 168
  4. 361
  5. 278
  6. 103
  7. 470
  8. 61
  9. 407
  10. 153
  11. 233
  12. 256
  13. 253
  14. 433
  15. 352
  16. 110
  17. 487
  18. 57
  19. 176
  20. 291
  21. 387
  22. 505
  23. 246
  24. 168
  25. 317
  26. 292
  27. 441
  28. 108
  29. 551
  30. 374
  31. 310
  32. 176
  33. 232
  34. 579
  35. 499
  36. 348
  37. 146
  38. 411
  39. 225
  40. 184

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