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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 655 · 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. 1.130 + 78 =
  2. 2.176 + 58 =
  3. 3.172 + 57 =
  4. 4.356 + 67 =
  5. 5.277 + 28 =
  6. 6.212 + 57 =
  7. 7.343 + 98 =
  8. 8.299 + 38 =
  9. 9.254 + 29 =
  10. 10.446 + 47 =
  11. 11.107 + 78 =
  12. 12.486 + 28 =
  13. 13.247 + 98 =
  14. 14.383 + 87 =
  15. 15.40 + 59 =
  16. 16.198 + 47 =
  17. 17.487 + 77 =
  18. 18.418 + 18 =
  19. 19.475 + 28 =
  20. 20.81 + 77 =
  21. 21.488 + 18 =
  22. 22.386 + 18 =
  23. 23.168 + 77 =
  24. 24.191 + 67 =
  25. 25.447 + 77 =
  26. 26.229 + 19 =
  27. 27.318 + 97 =
  28. 28.397 + 79 =
  29. 29.108 + 87 =
  30. 30.108 + 59 =
  31. 31.56 + 27 =
  32. 32.87 + 59 =
  33. 33.297 + 39 =
  34. 34.421 + 37 =
  35. 35.88 + 29 =
  36. 36.145 + 57 =
  37. 37.233 + 28 =
  38. 38.279 + 37 =
  39. 39.303 + 97 =
  40. 40.86 + 87 =

Answer key

  1. 208
  2. 234
  3. 229
  4. 423
  5. 305
  6. 269
  7. 441
  8. 337
  9. 283
  10. 493
  11. 185
  12. 514
  13. 345
  14. 470
  15. 99
  16. 245
  17. 564
  18. 436
  19. 503
  20. 158
  21. 506
  22. 404
  23. 245
  24. 258
  25. 524
  26. 248
  27. 415
  28. 476
  29. 195
  30. 167
  31. 83
  32. 146
  33. 336
  34. 458
  35. 117
  36. 202
  37. 261
  38. 316
  39. 400
  40. 173

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