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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 387 · 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. 1.176 + 27 =
  2. 2.410 + 38 =
  3. 3.86 + 37 =
  4. 4.442 + 78 =
  5. 5.452 + 29 =
  6. 6.151 + 97 =
  7. 7.316 + 77 =
  8. 8.262 + 78 =
  9. 9.438 + 97 =
  10. 10.253 + 17 =
  11. 11.342 + 88 =
  12. 12.492 + 38 =
  13. 13.285 + 99 =
  14. 14.454 + 77 =
  15. 15.352 + 88 =
  16. 16.221 + 47 =
  17. 17.157 + 79 =
  18. 18.41 + 18 =
  19. 19.296 + 68 =
  20. 20.238 + 18 =
  21. 21.287 + 49 =
  22. 22.64 + 67 =
  23. 23.127 + 47 =
  24. 24.290 + 68 =
  25. 25.279 + 98 =
  26. 26.403 + 67 =
  27. 27.326 + 47 =
  28. 28.311 + 27 =
  29. 29.359 + 17 =
  30. 30.190 + 67 =
  31. 31.300 + 88 =
  32. 32.30 + 37 =
  33. 33.390 + 87 =
  34. 34.134 + 87 =
  35. 35.28 + 58 =
  36. 36.123 + 99 =
  37. 37.269 + 39 =
  38. 38.396 + 98 =
  39. 39.251 + 89 =
  40. 40.415 + 59 =

Answer key

  1. 203
  2. 448
  3. 123
  4. 520
  5. 481
  6. 248
  7. 393
  8. 340
  9. 535
  10. 270
  11. 430
  12. 530
  13. 384
  14. 531
  15. 440
  16. 268
  17. 236
  18. 59
  19. 364
  20. 256
  21. 336
  22. 131
  23. 174
  24. 358
  25. 377
  26. 470
  27. 373
  28. 338
  29. 376
  30. 257
  31. 388
  32. 67
  33. 477
  34. 221
  35. 86
  36. 222
  37. 308
  38. 494
  39. 340
  40. 474

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