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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 636 · 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. 1.375 + 17 =
  2. 2.63 + 18 =
  3. 3.26 + 87 =
  4. 4.200 + 98 =
  5. 5.451 + 69 =
  6. 6.459 + 59 =
  7. 7.347 + 38 =
  8. 8.436 + 29 =
  9. 9.487 + 38 =
  10. 10.161 + 78 =
  11. 11.460 + 78 =
  12. 12.114 + 29 =
  13. 13.297 + 87 =
  14. 14.292 + 28 =
  15. 15.139 + 79 =
  16. 16.84 + 27 =
  17. 17.182 + 79 =
  18. 18.236 + 27 =
  19. 19.299 + 37 =
  20. 20.231 + 17 =
  21. 21.425 + 59 =
  22. 22.82 + 69 =
  23. 23.332 + 48 =
  24. 24.76 + 97 =
  25. 25.346 + 67 =
  26. 26.188 + 59 =
  27. 27.111 + 27 =
  28. 28.313 + 49 =
  29. 29.167 + 28 =
  30. 30.103 + 19 =
  31. 31.40 + 48 =
  32. 32.165 + 97 =
  33. 33.456 + 28 =
  34. 34.382 + 89 =
  35. 35.195 + 98 =
  36. 36.341 + 99 =
  37. 37.235 + 47 =
  38. 38.97 + 27 =
  39. 39.82 + 17 =
  40. 40.492 + 27 =

Answer key

  1. 392
  2. 81
  3. 113
  4. 298
  5. 520
  6. 518
  7. 385
  8. 465
  9. 525
  10. 239
  11. 538
  12. 143
  13. 384
  14. 320
  15. 218
  16. 111
  17. 261
  18. 263
  19. 336
  20. 248
  21. 484
  22. 151
  23. 380
  24. 173
  25. 413
  26. 247
  27. 138
  28. 362
  29. 195
  30. 122
  31. 88
  32. 262
  33. 484
  34. 471
  35. 293
  36. 440
  37. 282
  38. 124
  39. 99
  40. 519

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