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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 388 · 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. 1.93 + 97 =
  2. 2.306 + 27 =
  3. 3.487 + 17 =
  4. 4.30 + 18 =
  5. 5.309 + 97 =
  6. 6.458 + 99 =
  7. 7.92 + 67 =
  8. 8.91 + 97 =
  9. 9.65 + 38 =
  10. 10.30 + 77 =
  11. 11.318 + 18 =
  12. 12.100 + 57 =
  13. 13.345 + 88 =
  14. 14.99 + 57 =
  15. 15.305 + 59 =
  16. 16.87 + 69 =
  17. 17.236 + 49 =
  18. 18.454 + 59 =
  19. 19.121 + 79 =
  20. 20.478 + 38 =
  21. 21.308 + 37 =
  22. 22.325 + 39 =
  23. 23.306 + 58 =
  24. 24.446 + 69 =
  25. 25.212 + 17 =
  26. 26.443 + 19 =
  27. 27.249 + 28 =
  28. 28.70 + 89 =
  29. 29.495 + 47 =
  30. 30.410 + 69 =
  31. 31.179 + 88 =
  32. 32.348 + 18 =
  33. 33.98 + 79 =
  34. 34.425 + 27 =
  35. 35.489 + 87 =
  36. 36.128 + 57 =
  37. 37.275 + 29 =
  38. 38.424 + 69 =
  39. 39.71 + 37 =
  40. 40.236 + 49 =

Answer key

  1. 190
  2. 333
  3. 504
  4. 48
  5. 406
  6. 557
  7. 159
  8. 188
  9. 103
  10. 107
  11. 336
  12. 157
  13. 433
  14. 156
  15. 364
  16. 156
  17. 285
  18. 513
  19. 200
  20. 516
  21. 345
  22. 364
  23. 364
  24. 515
  25. 229
  26. 462
  27. 277
  28. 159
  29. 542
  30. 479
  31. 267
  32. 366
  33. 177
  34. 452
  35. 576
  36. 185
  37. 304
  38. 493
  39. 108
  40. 285

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