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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 79 · 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. 1.201 + 97 =
  2. 2.142 + 98 =
  3. 3.301 + 99 =
  4. 4.247 + 18 =
  5. 5.103 + 47 =
  6. 6.50 + 58 =
  7. 7.468 + 67 =
  8. 8.30 + 99 =
  9. 9.277 + 19 =
  10. 10.46 + 77 =
  11. 11.162 + 47 =
  12. 12.251 + 39 =
  13. 13.185 + 17 =
  14. 14.270 + 18 =
  15. 15.100 + 79 =
  16. 16.55 + 17 =
  17. 17.221 + 87 =
  18. 18.254 + 17 =
  19. 19.61 + 18 =
  20. 20.307 + 59 =
  21. 21.169 + 77 =
  22. 22.263 + 48 =
  23. 23.142 + 37 =
  24. 24.104 + 49 =
  25. 25.464 + 29 =
  26. 26.491 + 97 =
  27. 27.498 + 77 =
  28. 28.400 + 48 =
  29. 29.160 + 18 =
  30. 30.124 + 27 =
  31. 31.29 + 87 =
  32. 32.309 + 79 =
  33. 33.395 + 98 =
  34. 34.204 + 67 =
  35. 35.462 + 97 =
  36. 36.388 + 17 =
  37. 37.158 + 48 =
  38. 38.443 + 97 =
  39. 39.298 + 68 =
  40. 40.188 + 78 =

Answer key

  1. 298
  2. 240
  3. 400
  4. 265
  5. 150
  6. 108
  7. 535
  8. 129
  9. 296
  10. 123
  11. 209
  12. 290
  13. 202
  14. 288
  15. 179
  16. 72
  17. 308
  18. 271
  19. 79
  20. 366
  21. 246
  22. 311
  23. 179
  24. 153
  25. 493
  26. 588
  27. 575
  28. 448
  29. 178
  30. 151
  31. 116
  32. 388
  33. 493
  34. 271
  35. 559
  36. 405
  37. 206
  38. 540
  39. 366
  40. 266

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