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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 777 · 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. 1.281 + 27 =
  2. 2.74 + 18 =
  3. 3.467 + 57 =
  4. 4.238 + 87 =
  5. 5.107 + 37 =
  6. 6.376 + 87 =
  7. 7.165 + 39 =
  8. 8.335 + 38 =
  9. 9.40 + 39 =
  10. 10.138 + 48 =
  11. 11.358 + 68 =
  12. 12.111 + 18 =
  13. 13.380 + 77 =
  14. 14.221 + 18 =
  15. 15.128 + 99 =
  16. 16.307 + 79 =
  17. 17.353 + 87 =
  18. 18.154 + 98 =
  19. 19.128 + 39 =
  20. 20.98 + 77 =
  21. 21.326 + 19 =
  22. 22.156 + 28 =
  23. 23.194 + 39 =
  24. 24.427 + 57 =
  25. 25.342 + 28 =
  26. 26.336 + 59 =
  27. 27.450 + 78 =
  28. 28.138 + 67 =
  29. 29.83 + 57 =
  30. 30.313 + 59 =
  31. 31.177 + 57 =
  32. 32.370 + 38 =
  33. 33.148 + 57 =
  34. 34.377 + 29 =
  35. 35.277 + 47 =
  36. 36.131 + 87 =
  37. 37.226 + 47 =
  38. 38.289 + 87 =
  39. 39.60 + 27 =
  40. 40.350 + 19 =

Answer key

  1. 308
  2. 92
  3. 524
  4. 325
  5. 144
  6. 463
  7. 204
  8. 373
  9. 79
  10. 186
  11. 426
  12. 129
  13. 457
  14. 239
  15. 227
  16. 386
  17. 440
  18. 252
  19. 167
  20. 175
  21. 345
  22. 184
  23. 233
  24. 484
  25. 370
  26. 395
  27. 528
  28. 205
  29. 140
  30. 372
  31. 234
  32. 408
  33. 205
  34. 406
  35. 324
  36. 218
  37. 273
  38. 376
  39. 87
  40. 369

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