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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 480 · 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. 1.194 + 49 =
  2. 2.149 + 58 =
  3. 3.32 + 97 =
  4. 4.459 + 67 =
  5. 5.264 + 58 =
  6. 6.184 + 77 =
  7. 7.365 + 19 =
  8. 8.287 + 17 =
  9. 9.157 + 87 =
  10. 10.393 + 47 =
  11. 11.432 + 48 =
  12. 12.344 + 68 =
  13. 13.60 + 77 =
  14. 14.297 + 28 =
  15. 15.268 + 58 =
  16. 16.418 + 57 =
  17. 17.171 + 69 =
  18. 18.175 + 97 =
  19. 19.106 + 29 =
  20. 20.356 + 27 =
  21. 21.219 + 87 =
  22. 22.289 + 18 =
  23. 23.370 + 37 =
  24. 24.398 + 19 =
  25. 25.206 + 48 =
  26. 26.38 + 59 =
  27. 27.419 + 77 =
  28. 28.121 + 57 =
  29. 29.77 + 97 =
  30. 30.59 + 68 =
  31. 31.385 + 27 =
  32. 32.429 + 79 =
  33. 33.400 + 47 =
  34. 34.95 + 17 =
  35. 35.425 + 69 =
  36. 36.210 + 27 =
  37. 37.124 + 57 =
  38. 38.160 + 18 =
  39. 39.420 + 19 =
  40. 40.62 + 48 =

Answer key

  1. 243
  2. 207
  3. 129
  4. 526
  5. 322
  6. 261
  7. 384
  8. 304
  9. 244
  10. 440
  11. 480
  12. 412
  13. 137
  14. 325
  15. 326
  16. 475
  17. 240
  18. 272
  19. 135
  20. 383
  21. 306
  22. 307
  23. 407
  24. 417
  25. 254
  26. 97
  27. 496
  28. 178
  29. 174
  30. 127
  31. 412
  32. 508
  33. 447
  34. 112
  35. 494
  36. 237
  37. 181
  38. 178
  39. 439
  40. 110

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