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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 375 · 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. 1.321 + 18 =
  2. 2.383 + 78 =
  3. 3.158 + 39 =
  4. 4.292 + 68 =
  5. 5.150 + 87 =
  6. 6.462 + 68 =
  7. 7.162 + 88 =
  8. 8.431 + 37 =
  9. 9.33 + 49 =
  10. 10.348 + 97 =
  11. 11.480 + 47 =
  12. 12.247 + 27 =
  13. 13.354 + 49 =
  14. 14.473 + 69 =
  15. 15.165 + 27 =
  16. 16.254 + 69 =
  17. 17.413 + 89 =
  18. 18.319 + 79 =
  19. 19.228 + 17 =
  20. 20.207 + 78 =
  21. 21.204 + 39 =
  22. 22.398 + 17 =
  23. 23.117 + 29 =
  24. 24.48 + 58 =
  25. 25.473 + 48 =
  26. 26.313 + 68 =
  27. 27.92 + 48 =
  28. 28.133 + 17 =
  29. 29.138 + 18 =
  30. 30.471 + 47 =
  31. 31.163 + 17 =
  32. 32.223 + 39 =
  33. 33.53 + 78 =
  34. 34.346 + 97 =
  35. 35.97 + 38 =
  36. 36.249 + 47 =
  37. 37.344 + 67 =
  38. 38.210 + 38 =
  39. 39.113 + 79 =
  40. 40.308 + 37 =

Answer key

  1. 339
  2. 461
  3. 197
  4. 360
  5. 237
  6. 530
  7. 250
  8. 468
  9. 82
  10. 445
  11. 527
  12. 274
  13. 403
  14. 542
  15. 192
  16. 323
  17. 502
  18. 398
  19. 245
  20. 285
  21. 243
  22. 415
  23. 146
  24. 106
  25. 521
  26. 381
  27. 140
  28. 150
  29. 156
  30. 518
  31. 180
  32. 262
  33. 131
  34. 443
  35. 135
  36. 296
  37. 411
  38. 248
  39. 192
  40. 345

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