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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 745 · 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. 1.27 + 18 =
  2. 2.31 + 88 =
  3. 3.280 + 38 =
  4. 4.70 + 48 =
  5. 5.84 + 28 =
  6. 6.486 + 97 =
  7. 7.486 + 97 =
  8. 8.413 + 28 =
  9. 9.400 + 68 =
  10. 10.447 + 99 =
  11. 11.391 + 69 =
  12. 12.385 + 37 =
  13. 13.235 + 37 =
  14. 14.158 + 37 =
  15. 15.430 + 17 =
  16. 16.166 + 18 =
  17. 17.207 + 18 =
  18. 18.382 + 79 =
  19. 19.192 + 77 =
  20. 20.77 + 18 =
  21. 21.55 + 27 =
  22. 22.244 + 47 =
  23. 23.212 + 67 =
  24. 24.135 + 47 =
  25. 25.84 + 48 =
  26. 26.130 + 58 =
  27. 27.294 + 89 =
  28. 28.411 + 19 =
  29. 29.110 + 69 =
  30. 30.404 + 17 =
  31. 31.485 + 18 =
  32. 32.331 + 98 =
  33. 33.331 + 58 =
  34. 34.259 + 19 =
  35. 35.406 + 27 =
  36. 36.84 + 47 =
  37. 37.73 + 48 =
  38. 38.450 + 97 =
  39. 39.493 + 47 =
  40. 40.138 + 68 =

Answer key

  1. 45
  2. 119
  3. 318
  4. 118
  5. 112
  6. 583
  7. 583
  8. 441
  9. 468
  10. 546
  11. 460
  12. 422
  13. 272
  14. 195
  15. 447
  16. 184
  17. 225
  18. 461
  19. 269
  20. 95
  21. 82
  22. 291
  23. 279
  24. 182
  25. 132
  26. 188
  27. 383
  28. 430
  29. 179
  30. 421
  31. 503
  32. 429
  33. 389
  34. 278
  35. 433
  36. 131
  37. 121
  38. 547
  39. 540
  40. 206

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