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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 527 · 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. 1.125 + 48 =
  2. 2.153 + 47 =
  3. 3.411 + 27 =
  4. 4.77 + 19 =
  5. 5.29 + 29 =
  6. 6.154 + 38 =
  7. 7.481 + 28 =
  8. 8.169 + 17 =
  9. 9.72 + 88 =
  10. 10.472 + 17 =
  11. 11.166 + 57 =
  12. 12.363 + 57 =
  13. 13.361 + 57 =
  14. 14.110 + 59 =
  15. 15.103 + 28 =
  16. 16.125 + 89 =
  17. 17.259 + 78 =
  18. 18.158 + 37 =
  19. 19.496 + 19 =
  20. 20.28 + 39 =
  21. 21.282 + 98 =
  22. 22.487 + 48 =
  23. 23.159 + 37 =
  24. 24.338 + 17 =
  25. 25.382 + 28 =
  26. 26.411 + 27 =
  27. 27.122 + 39 =
  28. 28.247 + 77 =
  29. 29.310 + 99 =
  30. 30.447 + 58 =
  31. 31.82 + 28 =
  32. 32.399 + 87 =
  33. 33.94 + 38 =
  34. 34.269 + 78 =
  35. 35.279 + 87 =
  36. 36.62 + 28 =
  37. 37.163 + 29 =
  38. 38.362 + 69 =
  39. 39.188 + 89 =
  40. 40.32 + 49 =

Answer key

  1. 173
  2. 200
  3. 438
  4. 96
  5. 58
  6. 192
  7. 509
  8. 186
  9. 160
  10. 489
  11. 223
  12. 420
  13. 418
  14. 169
  15. 131
  16. 214
  17. 337
  18. 195
  19. 515
  20. 67
  21. 380
  22. 535
  23. 196
  24. 355
  25. 410
  26. 438
  27. 161
  28. 324
  29. 409
  30. 505
  31. 110
  32. 486
  33. 132
  34. 347
  35. 366
  36. 90
  37. 192
  38. 431
  39. 277
  40. 81

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