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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 251 · 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. 1.161 + 48 =
  2. 2.419 + 89 =
  3. 3.395 + 59 =
  4. 4.97 + 79 =
  5. 5.254 + 28 =
  6. 6.424 + 69 =
  7. 7.194 + 47 =
  8. 8.473 + 28 =
  9. 9.175 + 67 =
  10. 10.289 + 77 =
  11. 11.80 + 29 =
  12. 12.136 + 77 =
  13. 13.83 + 39 =
  14. 14.72 + 87 =
  15. 15.85 + 19 =
  16. 16.330 + 17 =
  17. 17.486 + 17 =
  18. 18.405 + 97 =
  19. 19.410 + 59 =
  20. 20.350 + 58 =
  21. 21.238 + 17 =
  22. 22.398 + 97 =
  23. 23.163 + 98 =
  24. 24.98 + 19 =
  25. 25.444 + 69 =
  26. 26.332 + 28 =
  27. 27.268 + 18 =
  28. 28.31 + 98 =
  29. 29.165 + 98 =
  30. 30.231 + 58 =
  31. 31.355 + 69 =
  32. 32.94 + 38 =
  33. 33.109 + 18 =
  34. 34.403 + 87 =
  35. 35.361 + 57 =
  36. 36.337 + 39 =
  37. 37.135 + 67 =
  38. 38.148 + 59 =
  39. 39.288 + 77 =
  40. 40.159 + 57 =

Answer key

  1. 209
  2. 508
  3. 454
  4. 176
  5. 282
  6. 493
  7. 241
  8. 501
  9. 242
  10. 366
  11. 109
  12. 213
  13. 122
  14. 159
  15. 104
  16. 347
  17. 503
  18. 502
  19. 469
  20. 408
  21. 255
  22. 495
  23. 261
  24. 117
  25. 513
  26. 360
  27. 286
  28. 129
  29. 263
  30. 289
  31. 424
  32. 132
  33. 127
  34. 490
  35. 418
  36. 376
  37. 202
  38. 207
  39. 365
  40. 216

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