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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 296 · 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. 1.421 + 77 =
  2. 2.389 + 99 =
  3. 3.303 + 38 =
  4. 4.86 + 47 =
  5. 5.169 + 47 =
  6. 6.289 + 68 =
  7. 7.257 + 19 =
  8. 8.444 + 87 =
  9. 9.68 + 57 =
  10. 10.256 + 99 =
  11. 11.323 + 58 =
  12. 12.426 + 87 =
  13. 13.75 + 69 =
  14. 14.360 + 59 =
  15. 15.215 + 38 =
  16. 16.237 + 79 =
  17. 17.441 + 58 =
  18. 18.75 + 17 =
  19. 19.227 + 18 =
  20. 20.396 + 67 =
  21. 21.120 + 87 =
  22. 22.377 + 27 =
  23. 23.400 + 47 =
  24. 24.464 + 49 =
  25. 25.230 + 47 =
  26. 26.373 + 49 =
  27. 27.160 + 29 =
  28. 28.177 + 28 =
  29. 29.122 + 38 =
  30. 30.373 + 28 =
  31. 31.298 + 89 =
  32. 32.295 + 69 =
  33. 33.53 + 67 =
  34. 34.469 + 57 =
  35. 35.300 + 98 =
  36. 36.112 + 49 =
  37. 37.304 + 19 =
  38. 38.224 + 19 =
  39. 39.414 + 77 =
  40. 40.112 + 49 =

Answer key

  1. 498
  2. 488
  3. 341
  4. 133
  5. 216
  6. 357
  7. 276
  8. 531
  9. 125
  10. 355
  11. 381
  12. 513
  13. 144
  14. 419
  15. 253
  16. 316
  17. 499
  18. 92
  19. 245
  20. 463
  21. 207
  22. 404
  23. 447
  24. 513
  25. 277
  26. 422
  27. 189
  28. 205
  29. 160
  30. 401
  31. 387
  32. 364
  33. 120
  34. 526
  35. 398
  36. 161
  37. 323
  38. 243
  39. 491
  40. 161

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