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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 503 · 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. 1.439 + 28 =
  2. 2.295 + 77 =
  3. 3.192 + 47 =
  4. 4.422 + 88 =
  5. 5.208 + 69 =
  6. 6.33 + 68 =
  7. 7.352 + 97 =
  8. 8.79 + 39 =
  9. 9.259 + 28 =
  10. 10.91 + 17 =
  11. 11.321 + 39 =
  12. 12.78 + 48 =
  13. 13.285 + 79 =
  14. 14.256 + 67 =
  15. 15.384 + 97 =
  16. 16.138 + 89 =
  17. 17.381 + 88 =
  18. 18.129 + 97 =
  19. 19.81 + 58 =
  20. 20.438 + 28 =
  21. 21.207 + 59 =
  22. 22.357 + 48 =
  23. 23.119 + 78 =
  24. 24.228 + 47 =
  25. 25.29 + 28 =
  26. 26.182 + 27 =
  27. 27.67 + 99 =
  28. 28.311 + 59 =
  29. 29.282 + 59 =
  30. 30.48 + 37 =
  31. 31.74 + 28 =
  32. 32.379 + 27 =
  33. 33.269 + 39 =
  34. 34.49 + 79 =
  35. 35.268 + 39 =
  36. 36.425 + 68 =
  37. 37.422 + 19 =
  38. 38.231 + 37 =
  39. 39.32 + 79 =
  40. 40.262 + 47 =

Answer key

  1. 467
  2. 372
  3. 239
  4. 510
  5. 277
  6. 101
  7. 449
  8. 118
  9. 287
  10. 108
  11. 360
  12. 126
  13. 364
  14. 323
  15. 481
  16. 227
  17. 469
  18. 226
  19. 139
  20. 466
  21. 266
  22. 405
  23. 197
  24. 275
  25. 57
  26. 209
  27. 166
  28. 370
  29. 341
  30. 85
  31. 102
  32. 406
  33. 308
  34. 128
  35. 307
  36. 493
  37. 441
  38. 268
  39. 111
  40. 309

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