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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 348 · 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. 1.155 + 59 =
  2. 2.431 + 17 =
  3. 3.253 + 28 =
  4. 4.146 + 68 =
  5. 5.144 + 97 =
  6. 6.474 + 39 =
  7. 7.317 + 37 =
  8. 8.326 + 18 =
  9. 9.103 + 87 =
  10. 10.103 + 47 =
  11. 11.123 + 97 =
  12. 12.154 + 78 =
  13. 13.149 + 87 =
  14. 14.128 + 27 =
  15. 15.437 + 39 =
  16. 16.36 + 67 =
  17. 17.315 + 97 =
  18. 18.204 + 67 =
  19. 19.92 + 39 =
  20. 20.474 + 49 =
  21. 21.73 + 99 =
  22. 22.225 + 18 =
  23. 23.390 + 68 =
  24. 24.58 + 49 =
  25. 25.275 + 37 =
  26. 26.120 + 69 =
  27. 27.291 + 77 =
  28. 28.351 + 97 =
  29. 29.250 + 67 =
  30. 30.69 + 69 =
  31. 31.213 + 27 =
  32. 32.297 + 47 =
  33. 33.283 + 87 =
  34. 34.328 + 47 =
  35. 35.275 + 18 =
  36. 36.388 + 87 =
  37. 37.358 + 19 =
  38. 38.34 + 57 =
  39. 39.197 + 47 =
  40. 40.231 + 69 =

Answer key

  1. 214
  2. 448
  3. 281
  4. 214
  5. 241
  6. 513
  7. 354
  8. 344
  9. 190
  10. 150
  11. 220
  12. 232
  13. 236
  14. 155
  15. 476
  16. 103
  17. 412
  18. 271
  19. 131
  20. 523
  21. 172
  22. 243
  23. 458
  24. 107
  25. 312
  26. 189
  27. 368
  28. 448
  29. 317
  30. 138
  31. 240
  32. 344
  33. 370
  34. 375
  35. 293
  36. 475
  37. 377
  38. 91
  39. 244
  40. 300

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