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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 958 · 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. 1.440 + 27 =
  2. 2.394 + 87 =
  3. 3.87 + 37 =
  4. 4.252 + 18 =
  5. 5.279 + 99 =
  6. 6.248 + 47 =
  7. 7.382 + 17 =
  8. 8.369 + 77 =
  9. 9.210 + 97 =
  10. 10.32 + 38 =
  11. 11.41 + 38 =
  12. 12.442 + 77 =
  13. 13.118 + 89 =
  14. 14.96 + 19 =
  15. 15.407 + 67 =
  16. 16.224 + 79 =
  17. 17.461 + 17 =
  18. 18.324 + 69 =
  19. 19.316 + 17 =
  20. 20.284 + 87 =
  21. 21.268 + 48 =
  22. 22.489 + 69 =
  23. 23.34 + 59 =
  24. 24.458 + 38 =
  25. 25.316 + 39 =
  26. 26.239 + 47 =
  27. 27.256 + 47 =
  28. 28.279 + 28 =
  29. 29.444 + 78 =
  30. 30.371 + 68 =
  31. 31.232 + 27 =
  32. 32.279 + 97 =
  33. 33.478 + 98 =
  34. 34.56 + 69 =
  35. 35.205 + 88 =
  36. 36.226 + 97 =
  37. 37.442 + 77 =
  38. 38.94 + 99 =
  39. 39.109 + 89 =
  40. 40.499 + 79 =

Answer key

  1. 467
  2. 481
  3. 124
  4. 270
  5. 378
  6. 295
  7. 399
  8. 446
  9. 307
  10. 70
  11. 79
  12. 519
  13. 207
  14. 115
  15. 474
  16. 303
  17. 478
  18. 393
  19. 333
  20. 371
  21. 316
  22. 558
  23. 93
  24. 496
  25. 355
  26. 286
  27. 303
  28. 307
  29. 522
  30. 439
  31. 259
  32. 376
  33. 576
  34. 125
  35. 293
  36. 323
  37. 519
  38. 193
  39. 198
  40. 578

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