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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 506 · 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 + 67 =
  2. 2.328 + 27 =
  3. 3.453 + 17 =
  4. 4.29 + 59 =
  5. 5.192 + 77 =
  6. 6.411 + 17 =
  7. 7.298 + 59 =
  8. 8.387 + 18 =
  9. 9.80 + 29 =
  10. 10.435 + 38 =
  11. 11.148 + 27 =
  12. 12.223 + 88 =
  13. 13.183 + 47 =
  14. 14.173 + 37 =
  15. 15.488 + 69 =
  16. 16.210 + 77 =
  17. 17.86 + 29 =
  18. 18.341 + 47 =
  19. 19.308 + 88 =
  20. 20.151 + 77 =
  21. 21.387 + 18 =
  22. 22.446 + 59 =
  23. 23.175 + 49 =
  24. 24.351 + 18 =
  25. 25.54 + 17 =
  26. 26.68 + 89 =
  27. 27.357 + 27 =
  28. 28.362 + 79 =
  29. 29.71 + 27 =
  30. 30.255 + 17 =
  31. 31.370 + 29 =
  32. 32.489 + 69 =
  33. 33.201 + 38 =
  34. 34.179 + 29 =
  35. 35.363 + 99 =
  36. 36.346 + 98 =
  37. 37.279 + 17 =
  38. 38.220 + 78 =
  39. 39.461 + 17 =
  40. 40.296 + 98 =

Answer key

  1. 94
  2. 355
  3. 470
  4. 88
  5. 269
  6. 428
  7. 357
  8. 405
  9. 109
  10. 473
  11. 175
  12. 311
  13. 230
  14. 210
  15. 557
  16. 287
  17. 115
  18. 388
  19. 396
  20. 228
  21. 405
  22. 505
  23. 224
  24. 369
  25. 71
  26. 157
  27. 384
  28. 441
  29. 98
  30. 272
  31. 399
  32. 558
  33. 239
  34. 208
  35. 462
  36. 444
  37. 296
  38. 298
  39. 478
  40. 394

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