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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 164 · 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. 1.28 + 27 =
  2. 2.415 + 59 =
  3. 3.309 + 67 =
  4. 4.403 + 18 =
  5. 5.371 + 68 =
  6. 6.41 + 67 =
  7. 7.157 + 17 =
  8. 8.187 + 17 =
  9. 9.264 + 17 =
  10. 10.120 + 48 =
  11. 11.206 + 17 =
  12. 12.76 + 97 =
  13. 13.250 + 88 =
  14. 14.360 + 19 =
  15. 15.143 + 58 =
  16. 16.83 + 47 =
  17. 17.361 + 18 =
  18. 18.371 + 17 =
  19. 19.352 + 97 =
  20. 20.443 + 97 =
  21. 21.356 + 17 =
  22. 22.417 + 88 =
  23. 23.331 + 47 =
  24. 24.422 + 77 =
  25. 25.210 + 87 =
  26. 26.194 + 98 =
  27. 27.76 + 18 =
  28. 28.46 + 27 =
  29. 29.178 + 19 =
  30. 30.246 + 17 =
  31. 31.325 + 47 =
  32. 32.171 + 97 =
  33. 33.280 + 68 =
  34. 34.405 + 78 =
  35. 35.247 + 87 =
  36. 36.225 + 19 =
  37. 37.36 + 68 =
  38. 38.342 + 67 =
  39. 39.467 + 67 =
  40. 40.299 + 79 =

Answer key

  1. 55
  2. 474
  3. 376
  4. 421
  5. 439
  6. 108
  7. 174
  8. 204
  9. 281
  10. 168
  11. 223
  12. 173
  13. 338
  14. 379
  15. 201
  16. 130
  17. 379
  18. 388
  19. 449
  20. 540
  21. 373
  22. 505
  23. 378
  24. 499
  25. 297
  26. 292
  27. 94
  28. 73
  29. 197
  30. 263
  31. 372
  32. 268
  33. 348
  34. 483
  35. 334
  36. 244
  37. 104
  38. 409
  39. 534
  40. 378

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