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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 849 · 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. 1.49 + 97 =
  2. 2.449 + 17 =
  3. 3.379 + 87 =
  4. 4.341 + 48 =
  5. 5.392 + 19 =
  6. 6.260 + 49 =
  7. 7.326 + 19 =
  8. 8.443 + 17 =
  9. 9.403 + 97 =
  10. 10.431 + 79 =
  11. 11.396 + 38 =
  12. 12.487 + 49 =
  13. 13.375 + 77 =
  14. 14.166 + 37 =
  15. 15.366 + 87 =
  16. 16.128 + 58 =
  17. 17.91 + 59 =
  18. 18.247 + 17 =
  19. 19.238 + 98 =
  20. 20.306 + 18 =
  21. 21.355 + 28 =
  22. 22.383 + 67 =
  23. 23.161 + 48 =
  24. 24.215 + 57 =
  25. 25.212 + 78 =
  26. 26.488 + 38 =
  27. 27.137 + 57 =
  28. 28.267 + 29 =
  29. 29.458 + 17 =
  30. 30.388 + 28 =
  31. 31.144 + 39 =
  32. 32.340 + 39 =
  33. 33.394 + 89 =
  34. 34.276 + 17 =
  35. 35.404 + 68 =
  36. 36.497 + 28 =
  37. 37.101 + 38 =
  38. 38.252 + 29 =
  39. 39.404 + 69 =
  40. 40.55 + 38 =

Answer key

  1. 146
  2. 466
  3. 466
  4. 389
  5. 411
  6. 309
  7. 345
  8. 460
  9. 500
  10. 510
  11. 434
  12. 536
  13. 452
  14. 203
  15. 453
  16. 186
  17. 150
  18. 264
  19. 336
  20. 324
  21. 383
  22. 450
  23. 209
  24. 272
  25. 290
  26. 526
  27. 194
  28. 296
  29. 475
  30. 416
  31. 183
  32. 379
  33. 483
  34. 293
  35. 472
  36. 525
  37. 139
  38. 281
  39. 473
  40. 93

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