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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 938 · 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. 1.197 + 58 =
  2. 2.65 + 67 =
  3. 3.452 + 77 =
  4. 4.449 + 67 =
  5. 5.185 + 68 =
  6. 6.365 + 29 =
  7. 7.75 + 79 =
  8. 8.107 + 18 =
  9. 9.106 + 78 =
  10. 10.449 + 58 =
  11. 11.416 + 99 =
  12. 12.480 + 89 =
  13. 13.242 + 48 =
  14. 14.438 + 68 =
  15. 15.174 + 18 =
  16. 16.484 + 49 =
  17. 17.378 + 37 =
  18. 18.342 + 89 =
  19. 19.140 + 47 =
  20. 20.75 + 58 =
  21. 21.61 + 97 =
  22. 22.345 + 97 =
  23. 23.439 + 69 =
  24. 24.396 + 17 =
  25. 25.154 + 47 =
  26. 26.296 + 17 =
  27. 27.256 + 19 =
  28. 28.470 + 57 =
  29. 29.349 + 38 =
  30. 30.457 + 27 =
  31. 31.202 + 28 =
  32. 32.272 + 17 =
  33. 33.335 + 59 =
  34. 34.159 + 69 =
  35. 35.496 + 47 =
  36. 36.68 + 58 =
  37. 37.383 + 78 =
  38. 38.231 + 97 =
  39. 39.398 + 88 =
  40. 40.72 + 39 =

Answer key

  1. 255
  2. 132
  3. 529
  4. 516
  5. 253
  6. 394
  7. 154
  8. 125
  9. 184
  10. 507
  11. 515
  12. 569
  13. 290
  14. 506
  15. 192
  16. 533
  17. 415
  18. 431
  19. 187
  20. 133
  21. 158
  22. 442
  23. 508
  24. 413
  25. 201
  26. 313
  27. 275
  28. 527
  29. 387
  30. 484
  31. 230
  32. 289
  33. 394
  34. 228
  35. 543
  36. 126
  37. 461
  38. 328
  39. 486
  40. 111

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