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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 150 · 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. 1.67 + 28 =
  2. 2.235 + 67 =
  3. 3.327 + 17 =
  4. 4.377 + 37 =
  5. 5.318 + 58 =
  6. 6.448 + 19 =
  7. 7.310 + 38 =
  8. 8.240 + 29 =
  9. 9.369 + 27 =
  10. 10.337 + 69 =
  11. 11.302 + 67 =
  12. 12.233 + 77 =
  13. 13.75 + 79 =
  14. 14.405 + 39 =
  15. 15.148 + 98 =
  16. 16.285 + 99 =
  17. 17.316 + 38 =
  18. 18.484 + 48 =
  19. 19.437 + 97 =
  20. 20.368 + 67 =
  21. 21.226 + 68 =
  22. 22.318 + 38 =
  23. 23.44 + 29 =
  24. 24.105 + 17 =
  25. 25.189 + 18 =
  26. 26.203 + 47 =
  27. 27.45 + 47 =
  28. 28.42 + 47 =
  29. 29.50 + 48 =
  30. 30.329 + 17 =
  31. 31.340 + 19 =
  32. 32.460 + 77 =
  33. 33.173 + 27 =
  34. 34.457 + 48 =
  35. 35.470 + 59 =
  36. 36.69 + 37 =
  37. 37.481 + 18 =
  38. 38.26 + 48 =
  39. 39.392 + 19 =
  40. 40.202 + 37 =

Answer key

  1. 95
  2. 302
  3. 344
  4. 414
  5. 376
  6. 467
  7. 348
  8. 269
  9. 396
  10. 406
  11. 369
  12. 310
  13. 154
  14. 444
  15. 246
  16. 384
  17. 354
  18. 532
  19. 534
  20. 435
  21. 294
  22. 356
  23. 73
  24. 122
  25. 207
  26. 250
  27. 92
  28. 89
  29. 98
  30. 346
  31. 359
  32. 537
  33. 200
  34. 505
  35. 529
  36. 106
  37. 499
  38. 74
  39. 411
  40. 239

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