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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 847 · 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. 1.395 + 98 =
  2. 2.465 + 57 =
  3. 3.317 + 99 =
  4. 4.88 + 88 =
  5. 5.306 + 39 =
  6. 6.151 + 17 =
  7. 7.105 + 58 =
  8. 8.431 + 19 =
  9. 9.265 + 48 =
  10. 10.400 + 99 =
  11. 11.318 + 37 =
  12. 12.133 + 29 =
  13. 13.470 + 67 =
  14. 14.255 + 88 =
  15. 15.395 + 99 =
  16. 16.394 + 68 =
  17. 17.156 + 19 =
  18. 18.41 + 19 =
  19. 19.373 + 38 =
  20. 20.479 + 68 =
  21. 21.450 + 97 =
  22. 22.334 + 58 =
  23. 23.53 + 28 =
  24. 24.256 + 38 =
  25. 25.482 + 57 =
  26. 26.94 + 47 =
  27. 27.48 + 39 =
  28. 28.115 + 37 =
  29. 29.119 + 77 =
  30. 30.108 + 79 =
  31. 31.479 + 27 =
  32. 32.453 + 68 =
  33. 33.131 + 69 =
  34. 34.368 + 79 =
  35. 35.96 + 87 =
  36. 36.356 + 78 =
  37. 37.488 + 98 =
  38. 38.389 + 78 =
  39. 39.369 + 59 =
  40. 40.228 + 29 =

Answer key

  1. 493
  2. 522
  3. 416
  4. 176
  5. 345
  6. 168
  7. 163
  8. 450
  9. 313
  10. 499
  11. 355
  12. 162
  13. 537
  14. 343
  15. 494
  16. 462
  17. 175
  18. 60
  19. 411
  20. 547
  21. 547
  22. 392
  23. 81
  24. 294
  25. 539
  26. 141
  27. 87
  28. 152
  29. 196
  30. 187
  31. 506
  32. 521
  33. 200
  34. 447
  35. 183
  36. 434
  37. 586
  38. 467
  39. 428
  40. 257

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