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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 274 · 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. 1.339 + 47 =
  2. 2.174 + 38 =
  3. 3.445 + 89 =
  4. 4.78 + 99 =
  5. 5.470 + 17 =
  6. 6.25 + 58 =
  7. 7.97 + 89 =
  8. 8.449 + 87 =
  9. 9.130 + 37 =
  10. 10.446 + 37 =
  11. 11.147 + 98 =
  12. 12.89 + 49 =
  13. 13.468 + 87 =
  14. 14.377 + 99 =
  15. 15.454 + 27 =
  16. 16.124 + 77 =
  17. 17.236 + 88 =
  18. 18.118 + 68 =
  19. 19.74 + 18 =
  20. 20.389 + 99 =
  21. 21.358 + 27 =
  22. 22.336 + 99 =
  23. 23.160 + 58 =
  24. 24.340 + 27 =
  25. 25.33 + 67 =
  26. 26.295 + 59 =
  27. 27.453 + 19 =
  28. 28.126 + 89 =
  29. 29.259 + 89 =
  30. 30.91 + 27 =
  31. 31.299 + 39 =
  32. 32.291 + 38 =
  33. 33.359 + 39 =
  34. 34.67 + 27 =
  35. 35.439 + 47 =
  36. 36.494 + 77 =
  37. 37.361 + 39 =
  38. 38.357 + 29 =
  39. 39.247 + 28 =
  40. 40.48 + 28 =

Answer key

  1. 386
  2. 212
  3. 534
  4. 177
  5. 487
  6. 83
  7. 186
  8. 536
  9. 167
  10. 483
  11. 245
  12. 138
  13. 555
  14. 476
  15. 481
  16. 201
  17. 324
  18. 186
  19. 92
  20. 488
  21. 385
  22. 435
  23. 218
  24. 367
  25. 100
  26. 354
  27. 472
  28. 215
  29. 348
  30. 118
  31. 338
  32. 329
  33. 398
  34. 94
  35. 486
  36. 571
  37. 400
  38. 386
  39. 275
  40. 76

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