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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 562 · 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. 1.388 + 67 =
  2. 2.480 + 87 =
  3. 3.56 + 37 =
  4. 4.152 + 67 =
  5. 5.43 + 18 =
  6. 6.263 + 48 =
  7. 7.259 + 98 =
  8. 8.459 + 87 =
  9. 9.90 + 48 =
  10. 10.286 + 19 =
  11. 11.49 + 67 =
  12. 12.29 + 68 =
  13. 13.310 + 67 =
  14. 14.343 + 58 =
  15. 15.473 + 99 =
  16. 16.390 + 18 =
  17. 17.62 + 67 =
  18. 18.319 + 77 =
  19. 19.73 + 37 =
  20. 20.175 + 28 =
  21. 21.493 + 47 =
  22. 22.273 + 29 =
  23. 23.484 + 97 =
  24. 24.365 + 29 =
  25. 25.242 + 98 =
  26. 26.418 + 37 =
  27. 27.269 + 29 =
  28. 28.298 + 39 =
  29. 29.396 + 48 =
  30. 30.499 + 89 =
  31. 31.88 + 67 =
  32. 32.76 + 79 =
  33. 33.448 + 38 =
  34. 34.86 + 39 =
  35. 35.372 + 47 =
  36. 36.200 + 18 =
  37. 37.177 + 97 =
  38. 38.421 + 19 =
  39. 39.403 + 17 =
  40. 40.396 + 27 =

Answer key

  1. 455
  2. 567
  3. 93
  4. 219
  5. 61
  6. 311
  7. 357
  8. 546
  9. 138
  10. 305
  11. 116
  12. 97
  13. 377
  14. 401
  15. 572
  16. 408
  17. 129
  18. 396
  19. 110
  20. 203
  21. 540
  22. 302
  23. 581
  24. 394
  25. 340
  26. 455
  27. 298
  28. 337
  29. 444
  30. 588
  31. 155
  32. 155
  33. 486
  34. 125
  35. 419
  36. 218
  37. 274
  38. 440
  39. 420
  40. 423

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