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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 400 · 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. 1.458 + 97 =
  2. 2.456 + 38 =
  3. 3.99 + 37 =
  4. 4.189 + 77 =
  5. 5.226 + 18 =
  6. 6.28 + 28 =
  7. 7.403 + 78 =
  8. 8.494 + 87 =
  9. 9.163 + 28 =
  10. 10.359 + 49 =
  11. 11.446 + 37 =
  12. 12.59 + 57 =
  13. 13.110 + 78 =
  14. 14.233 + 38 =
  15. 15.115 + 38 =
  16. 16.36 + 29 =
  17. 17.370 + 18 =
  18. 18.198 + 58 =
  19. 19.128 + 67 =
  20. 20.65 + 37 =
  21. 21.222 + 99 =
  22. 22.180 + 78 =
  23. 23.216 + 49 =
  24. 24.345 + 38 =
  25. 25.140 + 98 =
  26. 26.198 + 97 =
  27. 27.421 + 47 =
  28. 28.86 + 77 =
  29. 29.295 + 37 =
  30. 30.381 + 88 =
  31. 31.253 + 57 =
  32. 32.442 + 29 =
  33. 33.68 + 19 =
  34. 34.164 + 68 =
  35. 35.198 + 68 =
  36. 36.260 + 47 =
  37. 37.321 + 68 =
  38. 38.350 + 58 =
  39. 39.418 + 78 =
  40. 40.69 + 29 =

Answer key

  1. 555
  2. 494
  3. 136
  4. 266
  5. 244
  6. 56
  7. 481
  8. 581
  9. 191
  10. 408
  11. 483
  12. 116
  13. 188
  14. 271
  15. 153
  16. 65
  17. 388
  18. 256
  19. 195
  20. 102
  21. 321
  22. 258
  23. 265
  24. 383
  25. 238
  26. 295
  27. 468
  28. 163
  29. 332
  30. 469
  31. 310
  32. 471
  33. 87
  34. 232
  35. 266
  36. 307
  37. 389
  38. 408
  39. 496
  40. 98

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