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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 279 · 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. 1.280 + 69 =
  2. 2.337 + 78 =
  3. 3.472 + 27 =
  4. 4.355 + 57 =
  5. 5.109 + 57 =
  6. 6.100 + 18 =
  7. 7.76 + 28 =
  8. 8.97 + 17 =
  9. 9.234 + 99 =
  10. 10.245 + 17 =
  11. 11.28 + 58 =
  12. 12.341 + 78 =
  13. 13.126 + 47 =
  14. 14.259 + 77 =
  15. 15.205 + 27 =
  16. 16.355 + 17 =
  17. 17.38 + 69 =
  18. 18.298 + 77 =
  19. 19.242 + 27 =
  20. 20.26 + 38 =
  21. 21.175 + 38 =
  22. 22.232 + 67 =
  23. 23.108 + 97 =
  24. 24.102 + 97 =
  25. 25.98 + 47 =
  26. 26.420 + 58 =
  27. 27.32 + 77 =
  28. 28.484 + 99 =
  29. 29.361 + 18 =
  30. 30.57 + 37 =
  31. 31.323 + 88 =
  32. 32.254 + 97 =
  33. 33.230 + 68 =
  34. 34.200 + 69 =
  35. 35.62 + 79 =
  36. 36.455 + 77 =
  37. 37.141 + 27 =
  38. 38.175 + 37 =
  39. 39.234 + 27 =
  40. 40.111 + 58 =

Answer key

  1. 349
  2. 415
  3. 499
  4. 412
  5. 166
  6. 118
  7. 104
  8. 114
  9. 333
  10. 262
  11. 86
  12. 419
  13. 173
  14. 336
  15. 232
  16. 372
  17. 107
  18. 375
  19. 269
  20. 64
  21. 213
  22. 299
  23. 205
  24. 199
  25. 145
  26. 478
  27. 109
  28. 583
  29. 379
  30. 94
  31. 411
  32. 351
  33. 298
  34. 269
  35. 141
  36. 532
  37. 168
  38. 212
  39. 261
  40. 169

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