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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 681 · 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. 1.87 + 17 =
  2. 2.447 + 47 =
  3. 3.141 + 48 =
  4. 4.170 + 17 =
  5. 5.142 + 29 =
  6. 6.425 + 88 =
  7. 7.27 + 68 =
  8. 8.406 + 97 =
  9. 9.314 + 58 =
  10. 10.47 + 87 =
  11. 11.26 + 29 =
  12. 12.276 + 97 =
  13. 13.105 + 28 =
  14. 14.324 + 38 =
  15. 15.482 + 78 =
  16. 16.276 + 79 =
  17. 17.243 + 98 =
  18. 18.50 + 39 =
  19. 19.132 + 97 =
  20. 20.52 + 59 =
  21. 21.127 + 27 =
  22. 22.458 + 29 =
  23. 23.244 + 78 =
  24. 24.371 + 38 =
  25. 25.203 + 69 =
  26. 26.343 + 27 =
  27. 27.442 + 78 =
  28. 28.420 + 39 =
  29. 29.45 + 17 =
  30. 30.112 + 48 =
  31. 31.161 + 79 =
  32. 32.54 + 17 =
  33. 33.48 + 49 =
  34. 34.431 + 69 =
  35. 35.497 + 79 =
  36. 36.406 + 87 =
  37. 37.180 + 67 =
  38. 38.105 + 47 =
  39. 39.334 + 48 =
  40. 40.231 + 19 =

Answer key

  1. 104
  2. 494
  3. 189
  4. 187
  5. 171
  6. 513
  7. 95
  8. 503
  9. 372
  10. 134
  11. 55
  12. 373
  13. 133
  14. 362
  15. 560
  16. 355
  17. 341
  18. 89
  19. 229
  20. 111
  21. 154
  22. 487
  23. 322
  24. 409
  25. 272
  26. 370
  27. 520
  28. 459
  29. 62
  30. 160
  31. 240
  32. 71
  33. 97
  34. 500
  35. 576
  36. 493
  37. 247
  38. 152
  39. 382
  40. 250

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