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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 290 · 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. 1.292 + 58 =
  2. 2.423 + 29 =
  3. 3.160 + 29 =
  4. 4.408 + 87 =
  5. 5.440 + 39 =
  6. 6.430 + 97 =
  7. 7.59 + 39 =
  8. 8.79 + 88 =
  9. 9.57 + 57 =
  10. 10.100 + 28 =
  11. 11.490 + 47 =
  12. 12.422 + 79 =
  13. 13.51 + 87 =
  14. 14.217 + 48 =
  15. 15.137 + 79 =
  16. 16.499 + 67 =
  17. 17.362 + 57 =
  18. 18.132 + 39 =
  19. 19.40 + 89 =
  20. 20.115 + 37 =
  21. 21.89 + 28 =
  22. 22.497 + 47 =
  23. 23.27 + 87 =
  24. 24.370 + 47 =
  25. 25.260 + 47 =
  26. 26.78 + 59 =
  27. 27.272 + 69 =
  28. 28.204 + 58 =
  29. 29.470 + 57 =
  30. 30.300 + 97 =
  31. 31.144 + 79 =
  32. 32.93 + 19 =
  33. 33.244 + 77 =
  34. 34.279 + 37 =
  35. 35.71 + 37 =
  36. 36.249 + 97 =
  37. 37.472 + 98 =
  38. 38.404 + 59 =
  39. 39.204 + 48 =
  40. 40.128 + 27 =

Answer key

  1. 350
  2. 452
  3. 189
  4. 495
  5. 479
  6. 527
  7. 98
  8. 167
  9. 114
  10. 128
  11. 537
  12. 501
  13. 138
  14. 265
  15. 216
  16. 566
  17. 419
  18. 171
  19. 129
  20. 152
  21. 117
  22. 544
  23. 114
  24. 417
  25. 307
  26. 137
  27. 341
  28. 262
  29. 527
  30. 397
  31. 223
  32. 112
  33. 321
  34. 316
  35. 108
  36. 346
  37. 570
  38. 463
  39. 252
  40. 155

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