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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 23 · 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. 1.81 + 38 =
  2. 2.210 + 58 =
  3. 3.228 + 38 =
  4. 4.420 + 99 =
  5. 5.142 + 19 =
  6. 6.440 + 19 =
  7. 7.189 + 87 =
  8. 8.411 + 57 =
  9. 9.273 + 38 =
  10. 10.336 + 89 =
  11. 11.174 + 49 =
  12. 12.41 + 37 =
  13. 13.339 + 49 =
  14. 14.210 + 39 =
  15. 15.196 + 97 =
  16. 16.366 + 27 =
  17. 17.231 + 17 =
  18. 18.384 + 29 =
  19. 19.52 + 99 =
  20. 20.463 + 99 =
  21. 21.254 + 47 =
  22. 22.414 + 87 =
  23. 23.175 + 27 =
  24. 24.300 + 57 =
  25. 25.165 + 97 =
  26. 26.419 + 27 =
  27. 27.246 + 38 =
  28. 28.93 + 58 =
  29. 29.282 + 48 =
  30. 30.258 + 29 =
  31. 31.239 + 19 =
  32. 32.49 + 88 =
  33. 33.360 + 77 =
  34. 34.424 + 97 =
  35. 35.29 + 19 =
  36. 36.167 + 68 =
  37. 37.46 + 57 =
  38. 38.129 + 38 =
  39. 39.487 + 37 =
  40. 40.160 + 29 =

Answer key

  1. 119
  2. 268
  3. 266
  4. 519
  5. 161
  6. 459
  7. 276
  8. 468
  9. 311
  10. 425
  11. 223
  12. 78
  13. 388
  14. 249
  15. 293
  16. 393
  17. 248
  18. 413
  19. 151
  20. 562
  21. 301
  22. 501
  23. 202
  24. 357
  25. 262
  26. 446
  27. 284
  28. 151
  29. 330
  30. 287
  31. 258
  32. 137
  33. 437
  34. 521
  35. 48
  36. 235
  37. 103
  38. 167
  39. 524
  40. 189

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