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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 519 · 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. 1.66 + 97 =
  2. 2.33 + 97 =
  3. 3.328 + 27 =
  4. 4.170 + 99 =
  5. 5.348 + 78 =
  6. 6.444 + 37 =
  7. 7.434 + 97 =
  8. 8.372 + 89 =
  9. 9.275 + 27 =
  10. 10.484 + 37 =
  11. 11.67 + 68 =
  12. 12.140 + 39 =
  13. 13.65 + 48 =
  14. 14.102 + 18 =
  15. 15.327 + 39 =
  16. 16.111 + 49 =
  17. 17.162 + 57 =
  18. 18.146 + 29 =
  19. 19.362 + 29 =
  20. 20.370 + 77 =
  21. 21.42 + 68 =
  22. 22.359 + 99 =
  23. 23.314 + 19 =
  24. 24.331 + 79 =
  25. 25.275 + 17 =
  26. 26.76 + 39 =
  27. 27.494 + 17 =
  28. 28.114 + 28 =
  29. 29.119 + 47 =
  30. 30.79 + 28 =
  31. 31.272 + 67 =
  32. 32.380 + 17 =
  33. 33.362 + 77 =
  34. 34.106 + 88 =
  35. 35.388 + 88 =
  36. 36.390 + 27 =
  37. 37.106 + 39 =
  38. 38.169 + 28 =
  39. 39.228 + 38 =
  40. 40.71 + 78 =

Answer key

  1. 163
  2. 130
  3. 355
  4. 269
  5. 426
  6. 481
  7. 531
  8. 461
  9. 302
  10. 521
  11. 135
  12. 179
  13. 113
  14. 120
  15. 366
  16. 160
  17. 219
  18. 175
  19. 391
  20. 447
  21. 110
  22. 458
  23. 333
  24. 410
  25. 292
  26. 115
  27. 511
  28. 142
  29. 166
  30. 107
  31. 339
  32. 397
  33. 439
  34. 194
  35. 476
  36. 417
  37. 145
  38. 197
  39. 266
  40. 149

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