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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 576 · 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. 1.177 + 58 =
  2. 2.459 + 49 =
  3. 3.44 + 39 =
  4. 4.493 + 69 =
  5. 5.333 + 98 =
  6. 6.65 + 89 =
  7. 7.37 + 98 =
  8. 8.91 + 99 =
  9. 9.83 + 28 =
  10. 10.483 + 17 =
  11. 11.398 + 18 =
  12. 12.410 + 89 =
  13. 13.474 + 97 =
  14. 14.348 + 57 =
  15. 15.433 + 19 =
  16. 16.372 + 47 =
  17. 17.489 + 18 =
  18. 18.439 + 69 =
  19. 19.468 + 67 =
  20. 20.199 + 38 =
  21. 21.328 + 39 =
  22. 22.285 + 18 =
  23. 23.67 + 18 =
  24. 24.61 + 37 =
  25. 25.133 + 79 =
  26. 26.210 + 79 =
  27. 27.185 + 47 =
  28. 28.481 + 88 =
  29. 29.35 + 39 =
  30. 30.192 + 67 =
  31. 31.256 + 58 =
  32. 32.184 + 68 =
  33. 33.38 + 99 =
  34. 34.324 + 78 =
  35. 35.361 + 89 =
  36. 36.237 + 29 =
  37. 37.364 + 87 =
  38. 38.159 + 88 =
  39. 39.142 + 28 =
  40. 40.468 + 58 =

Answer key

  1. 235
  2. 508
  3. 83
  4. 562
  5. 431
  6. 154
  7. 135
  8. 190
  9. 111
  10. 500
  11. 416
  12. 499
  13. 571
  14. 405
  15. 452
  16. 419
  17. 507
  18. 508
  19. 535
  20. 237
  21. 367
  22. 303
  23. 85
  24. 98
  25. 212
  26. 289
  27. 232
  28. 569
  29. 74
  30. 259
  31. 314
  32. 252
  33. 137
  34. 402
  35. 450
  36. 266
  37. 451
  38. 247
  39. 170
  40. 526

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