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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 628 · 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. 1.307 + 88 =
  2. 2.413 + 17 =
  3. 3.25 + 28 =
  4. 4.35 + 69 =
  5. 5.119 + 49 =
  6. 6.394 + 19 =
  7. 7.71 + 78 =
  8. 8.54 + 17 =
  9. 9.342 + 78 =
  10. 10.43 + 68 =
  11. 11.56 + 48 =
  12. 12.389 + 78 =
  13. 13.248 + 18 =
  14. 14.102 + 97 =
  15. 15.115 + 19 =
  16. 16.399 + 28 =
  17. 17.108 + 29 =
  18. 18.431 + 69 =
  19. 19.65 + 17 =
  20. 20.73 + 38 =
  21. 21.485 + 47 =
  22. 22.411 + 67 =
  23. 23.389 + 98 =
  24. 24.49 + 78 =
  25. 25.330 + 37 =
  26. 26.186 + 17 =
  27. 27.317 + 97 =
  28. 28.73 + 38 =
  29. 29.114 + 99 =
  30. 30.53 + 98 =
  31. 31.73 + 69 =
  32. 32.396 + 38 =
  33. 33.236 + 18 =
  34. 34.393 + 69 =
  35. 35.308 + 38 =
  36. 36.465 + 29 =
  37. 37.76 + 39 =
  38. 38.210 + 17 =
  39. 39.492 + 77 =
  40. 40.413 + 19 =

Answer key

  1. 395
  2. 430
  3. 53
  4. 104
  5. 168
  6. 413
  7. 149
  8. 71
  9. 420
  10. 111
  11. 104
  12. 467
  13. 266
  14. 199
  15. 134
  16. 427
  17. 137
  18. 500
  19. 82
  20. 111
  21. 532
  22. 478
  23. 487
  24. 127
  25. 367
  26. 203
  27. 414
  28. 111
  29. 213
  30. 151
  31. 142
  32. 434
  33. 254
  34. 462
  35. 346
  36. 494
  37. 115
  38. 227
  39. 569
  40. 432

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