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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 685 · 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. 1.99 + 79 =
  2. 2.210 + 48 =
  3. 3.143 + 19 =
  4. 4.360 + 37 =
  5. 5.359 + 78 =
  6. 6.226 + 97 =
  7. 7.330 + 69 =
  8. 8.331 + 18 =
  9. 9.114 + 29 =
  10. 10.81 + 19 =
  11. 11.220 + 27 =
  12. 12.132 + 27 =
  13. 13.344 + 69 =
  14. 14.130 + 27 =
  15. 15.392 + 79 =
  16. 16.154 + 97 =
  17. 17.149 + 78 =
  18. 18.94 + 59 =
  19. 19.33 + 59 =
  20. 20.211 + 39 =
  21. 21.469 + 99 =
  22. 22.161 + 39 =
  23. 23.319 + 58 =
  24. 24.96 + 47 =
  25. 25.32 + 78 =
  26. 26.157 + 48 =
  27. 27.29 + 28 =
  28. 28.269 + 69 =
  29. 29.114 + 58 =
  30. 30.326 + 87 =
  31. 31.311 + 57 =
  32. 32.161 + 29 =
  33. 33.379 + 77 =
  34. 34.416 + 38 =
  35. 35.100 + 27 =
  36. 36.44 + 38 =
  37. 37.58 + 58 =
  38. 38.398 + 39 =
  39. 39.187 + 48 =
  40. 40.62 + 89 =

Answer key

  1. 178
  2. 258
  3. 162
  4. 397
  5. 437
  6. 323
  7. 399
  8. 349
  9. 143
  10. 100
  11. 247
  12. 159
  13. 413
  14. 157
  15. 471
  16. 251
  17. 227
  18. 153
  19. 92
  20. 250
  21. 568
  22. 200
  23. 377
  24. 143
  25. 110
  26. 205
  27. 57
  28. 338
  29. 172
  30. 413
  31. 368
  32. 190
  33. 456
  34. 454
  35. 127
  36. 82
  37. 116
  38. 437
  39. 235
  40. 151

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