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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 486 · 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. 1.385 + 79 =
  2. 2.77 + 19 =
  3. 3.197 + 78 =
  4. 4.484 + 29 =
  5. 5.275 + 39 =
  6. 6.298 + 18 =
  7. 7.34 + 89 =
  8. 8.28 + 88 =
  9. 9.50 + 27 =
  10. 10.294 + 29 =
  11. 11.104 + 49 =
  12. 12.218 + 87 =
  13. 13.269 + 18 =
  14. 14.81 + 39 =
  15. 15.385 + 59 =
  16. 16.29 + 17 =
  17. 17.82 + 19 =
  18. 18.426 + 98 =
  19. 19.84 + 29 =
  20. 20.383 + 49 =
  21. 21.463 + 28 =
  22. 22.85 + 37 =
  23. 23.202 + 58 =
  24. 24.297 + 69 =
  25. 25.391 + 17 =
  26. 26.438 + 37 =
  27. 27.99 + 99 =
  28. 28.300 + 38 =
  29. 29.296 + 59 =
  30. 30.363 + 57 =
  31. 31.415 + 17 =
  32. 32.347 + 97 =
  33. 33.99 + 68 =
  34. 34.447 + 28 =
  35. 35.387 + 47 =
  36. 36.377 + 37 =
  37. 37.150 + 37 =
  38. 38.258 + 19 =
  39. 39.348 + 69 =
  40. 40.460 + 69 =

Answer key

  1. 464
  2. 96
  3. 275
  4. 513
  5. 314
  6. 316
  7. 123
  8. 116
  9. 77
  10. 323
  11. 153
  12. 305
  13. 287
  14. 120
  15. 444
  16. 46
  17. 101
  18. 524
  19. 113
  20. 432
  21. 491
  22. 122
  23. 260
  24. 366
  25. 408
  26. 475
  27. 198
  28. 338
  29. 355
  30. 420
  31. 432
  32. 444
  33. 167
  34. 475
  35. 434
  36. 414
  37. 187
  38. 277
  39. 417
  40. 529

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