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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 382 · 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. 1.399 + 79 =
  2. 2.147 + 79 =
  3. 3.475 + 59 =
  4. 4.144 + 47 =
  5. 5.282 + 47 =
  6. 6.260 + 27 =
  7. 7.29 + 89 =
  8. 8.76 + 17 =
  9. 9.485 + 98 =
  10. 10.271 + 47 =
  11. 11.61 + 97 =
  12. 12.95 + 37 =
  13. 13.89 + 19 =
  14. 14.266 + 27 =
  15. 15.360 + 57 =
  16. 16.437 + 97 =
  17. 17.141 + 19 =
  18. 18.94 + 19 =
  19. 19.377 + 28 =
  20. 20.184 + 39 =
  21. 21.141 + 39 =
  22. 22.497 + 28 =
  23. 23.329 + 38 =
  24. 24.178 + 38 =
  25. 25.364 + 38 =
  26. 26.250 + 88 =
  27. 27.153 + 19 =
  28. 28.162 + 58 =
  29. 29.331 + 87 =
  30. 30.118 + 88 =
  31. 31.256 + 88 =
  32. 32.119 + 37 =
  33. 33.55 + 78 =
  34. 34.161 + 78 =
  35. 35.406 + 88 =
  36. 36.110 + 67 =
  37. 37.268 + 97 =
  38. 38.391 + 47 =
  39. 39.449 + 79 =
  40. 40.276 + 67 =

Answer key

  1. 478
  2. 226
  3. 534
  4. 191
  5. 329
  6. 287
  7. 118
  8. 93
  9. 583
  10. 318
  11. 158
  12. 132
  13. 108
  14. 293
  15. 417
  16. 534
  17. 160
  18. 113
  19. 405
  20. 223
  21. 180
  22. 525
  23. 367
  24. 216
  25. 402
  26. 338
  27. 172
  28. 220
  29. 418
  30. 206
  31. 344
  32. 156
  33. 133
  34. 239
  35. 494
  36. 177
  37. 365
  38. 438
  39. 528
  40. 343

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