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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 131 · 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. 1.318 + 77 =
  2. 2.40 + 28 =
  3. 3.382 + 58 =
  4. 4.154 + 38 =
  5. 5.464 + 57 =
  6. 6.460 + 27 =
  7. 7.225 + 48 =
  8. 8.281 + 58 =
  9. 9.424 + 39 =
  10. 10.440 + 78 =
  11. 11.373 + 28 =
  12. 12.132 + 29 =
  13. 13.436 + 49 =
  14. 14.298 + 17 =
  15. 15.34 + 58 =
  16. 16.366 + 98 =
  17. 17.181 + 19 =
  18. 18.63 + 97 =
  19. 19.289 + 57 =
  20. 20.163 + 47 =
  21. 21.446 + 67 =
  22. 22.78 + 38 =
  23. 23.290 + 99 =
  24. 24.82 + 78 =
  25. 25.258 + 77 =
  26. 26.39 + 69 =
  27. 27.132 + 79 =
  28. 28.74 + 39 =
  29. 29.29 + 47 =
  30. 30.451 + 29 =
  31. 31.313 + 68 =
  32. 32.133 + 98 =
  33. 33.35 + 77 =
  34. 34.273 + 27 =
  35. 35.97 + 88 =
  36. 36.455 + 18 =
  37. 37.327 + 98 =
  38. 38.83 + 38 =
  39. 39.425 + 48 =
  40. 40.433 + 38 =

Answer key

  1. 395
  2. 68
  3. 440
  4. 192
  5. 521
  6. 487
  7. 273
  8. 339
  9. 463
  10. 518
  11. 401
  12. 161
  13. 485
  14. 315
  15. 92
  16. 464
  17. 200
  18. 160
  19. 346
  20. 210
  21. 513
  22. 116
  23. 389
  24. 160
  25. 335
  26. 108
  27. 211
  28. 113
  29. 76
  30. 480
  31. 381
  32. 231
  33. 112
  34. 300
  35. 185
  36. 473
  37. 425
  38. 121
  39. 473
  40. 471

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