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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 316 · 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. 1.159 + 67 =
  2. 2.406 + 98 =
  3. 3.321 + 57 =
  4. 4.29 + 27 =
  5. 5.71 + 98 =
  6. 6.326 + 89 =
  7. 7.317 + 78 =
  8. 8.407 + 37 =
  9. 9.484 + 67 =
  10. 10.329 + 97 =
  11. 11.431 + 77 =
  12. 12.281 + 58 =
  13. 13.404 + 77 =
  14. 14.100 + 77 =
  15. 15.289 + 47 =
  16. 16.67 + 29 =
  17. 17.68 + 99 =
  18. 18.382 + 59 =
  19. 19.215 + 59 =
  20. 20.41 + 28 =
  21. 21.257 + 67 =
  22. 22.416 + 17 =
  23. 23.150 + 77 =
  24. 24.133 + 38 =
  25. 25.144 + 87 =
  26. 26.460 + 99 =
  27. 27.175 + 47 =
  28. 28.453 + 99 =
  29. 29.169 + 27 =
  30. 30.155 + 18 =
  31. 31.335 + 47 =
  32. 32.490 + 68 =
  33. 33.359 + 97 =
  34. 34.133 + 57 =
  35. 35.448 + 47 =
  36. 36.254 + 37 =
  37. 37.95 + 79 =
  38. 38.26 + 88 =
  39. 39.393 + 79 =
  40. 40.480 + 67 =

Answer key

  1. 226
  2. 504
  3. 378
  4. 56
  5. 169
  6. 415
  7. 395
  8. 444
  9. 551
  10. 426
  11. 508
  12. 339
  13. 481
  14. 177
  15. 336
  16. 96
  17. 167
  18. 441
  19. 274
  20. 69
  21. 324
  22. 433
  23. 227
  24. 171
  25. 231
  26. 559
  27. 222
  28. 552
  29. 196
  30. 173
  31. 382
  32. 558
  33. 456
  34. 190
  35. 495
  36. 291
  37. 174
  38. 114
  39. 472
  40. 547

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