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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 625 · 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. 1.357 + 59 =
  2. 2.428 + 38 =
  3. 3.162 + 88 =
  4. 4.100 + 89 =
  5. 5.435 + 18 =
  6. 6.164 + 89 =
  7. 7.87 + 57 =
  8. 8.219 + 39 =
  9. 9.26 + 89 =
  10. 10.51 + 27 =
  11. 11.195 + 28 =
  12. 12.166 + 67 =
  13. 13.403 + 68 =
  14. 14.347 + 47 =
  15. 15.91 + 48 =
  16. 16.498 + 29 =
  17. 17.329 + 19 =
  18. 18.52 + 79 =
  19. 19.272 + 27 =
  20. 20.292 + 38 =
  21. 21.430 + 47 =
  22. 22.495 + 49 =
  23. 23.287 + 79 =
  24. 24.381 + 48 =
  25. 25.429 + 57 =
  26. 26.439 + 87 =
  27. 27.175 + 98 =
  28. 28.224 + 87 =
  29. 29.210 + 88 =
  30. 30.261 + 89 =
  31. 31.385 + 77 =
  32. 32.238 + 29 =
  33. 33.295 + 67 =
  34. 34.45 + 17 =
  35. 35.498 + 78 =
  36. 36.199 + 69 =
  37. 37.226 + 19 =
  38. 38.66 + 37 =
  39. 39.237 + 27 =
  40. 40.225 + 57 =

Answer key

  1. 416
  2. 466
  3. 250
  4. 189
  5. 453
  6. 253
  7. 144
  8. 258
  9. 115
  10. 78
  11. 223
  12. 233
  13. 471
  14. 394
  15. 139
  16. 527
  17. 348
  18. 131
  19. 299
  20. 330
  21. 477
  22. 544
  23. 366
  24. 429
  25. 486
  26. 526
  27. 273
  28. 311
  29. 298
  30. 350
  31. 462
  32. 267
  33. 362
  34. 62
  35. 576
  36. 268
  37. 245
  38. 103
  39. 264
  40. 282

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