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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 265 · 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. 1.361 + 67 =
  2. 2.203 + 27 =
  3. 3.113 + 89 =
  4. 4.329 + 69 =
  5. 5.338 + 28 =
  6. 6.66 + 68 =
  7. 7.127 + 57 =
  8. 8.324 + 29 =
  9. 9.317 + 98 =
  10. 10.117 + 78 =
  11. 11.176 + 77 =
  12. 12.307 + 88 =
  13. 13.356 + 57 =
  14. 14.452 + 97 =
  15. 15.467 + 17 =
  16. 16.403 + 37 =
  17. 17.366 + 19 =
  18. 18.83 + 27 =
  19. 19.390 + 29 =
  20. 20.127 + 47 =
  21. 21.349 + 58 =
  22. 22.259 + 27 =
  23. 23.295 + 59 =
  24. 24.55 + 97 =
  25. 25.381 + 57 =
  26. 26.137 + 49 =
  27. 27.292 + 29 =
  28. 28.418 + 19 =
  29. 29.115 + 18 =
  30. 30.442 + 77 =
  31. 31.75 + 99 =
  32. 32.176 + 37 =
  33. 33.416 + 18 =
  34. 34.134 + 88 =
  35. 35.168 + 87 =
  36. 36.442 + 77 =
  37. 37.141 + 68 =
  38. 38.434 + 79 =
  39. 39.261 + 28 =
  40. 40.88 + 78 =

Answer key

  1. 428
  2. 230
  3. 202
  4. 398
  5. 366
  6. 134
  7. 184
  8. 353
  9. 415
  10. 195
  11. 253
  12. 395
  13. 413
  14. 549
  15. 484
  16. 440
  17. 385
  18. 110
  19. 419
  20. 174
  21. 407
  22. 286
  23. 354
  24. 152
  25. 438
  26. 186
  27. 321
  28. 437
  29. 133
  30. 519
  31. 174
  32. 213
  33. 434
  34. 222
  35. 255
  36. 519
  37. 209
  38. 513
  39. 289
  40. 166

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