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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 438 · 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. 1.294 + 57 =
  2. 2.66 + 59 =
  3. 3.191 + 38 =
  4. 4.406 + 57 =
  5. 5.398 + 47 =
  6. 6.249 + 68 =
  7. 7.78 + 57 =
  8. 8.421 + 79 =
  9. 9.352 + 68 =
  10. 10.76 + 37 =
  11. 11.31 + 58 =
  12. 12.32 + 59 =
  13. 13.143 + 79 =
  14. 14.162 + 18 =
  15. 15.49 + 98 =
  16. 16.308 + 39 =
  17. 17.129 + 47 =
  18. 18.238 + 98 =
  19. 19.147 + 49 =
  20. 20.438 + 27 =
  21. 21.325 + 29 =
  22. 22.182 + 27 =
  23. 23.380 + 58 =
  24. 24.478 + 49 =
  25. 25.256 + 68 =
  26. 26.363 + 78 =
  27. 27.419 + 19 =
  28. 28.317 + 78 =
  29. 29.496 + 17 =
  30. 30.265 + 49 =
  31. 31.192 + 69 =
  32. 32.407 + 78 =
  33. 33.441 + 57 =
  34. 34.373 + 38 =
  35. 35.238 + 57 =
  36. 36.97 + 39 =
  37. 37.363 + 38 =
  38. 38.265 + 77 =
  39. 39.327 + 99 =
  40. 40.454 + 27 =

Answer key

  1. 351
  2. 125
  3. 229
  4. 463
  5. 445
  6. 317
  7. 135
  8. 500
  9. 420
  10. 113
  11. 89
  12. 91
  13. 222
  14. 180
  15. 147
  16. 347
  17. 176
  18. 336
  19. 196
  20. 465
  21. 354
  22. 209
  23. 438
  24. 527
  25. 324
  26. 441
  27. 438
  28. 395
  29. 513
  30. 314
  31. 261
  32. 485
  33. 498
  34. 411
  35. 295
  36. 136
  37. 401
  38. 342
  39. 426
  40. 481

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