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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 779 · 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. 1.226 + 97 =
  2. 2.52 + 89 =
  3. 3.50 + 17 =
  4. 4.442 + 27 =
  5. 5.123 + 28 =
  6. 6.287 + 17 =
  7. 7.406 + 37 =
  8. 8.368 + 58 =
  9. 9.394 + 78 =
  10. 10.143 + 68 =
  11. 11.470 + 59 =
  12. 12.77 + 98 =
  13. 13.304 + 57 =
  14. 14.91 + 88 =
  15. 15.277 + 29 =
  16. 16.386 + 58 =
  17. 17.83 + 69 =
  18. 18.26 + 47 =
  19. 19.387 + 98 =
  20. 20.393 + 18 =
  21. 21.90 + 88 =
  22. 22.41 + 19 =
  23. 23.367 + 89 =
  24. 24.179 + 58 =
  25. 25.251 + 29 =
  26. 26.241 + 87 =
  27. 27.153 + 18 =
  28. 28.404 + 29 =
  29. 29.242 + 78 =
  30. 30.353 + 67 =
  31. 31.439 + 57 =
  32. 32.298 + 78 =
  33. 33.191 + 97 =
  34. 34.36 + 17 =
  35. 35.372 + 37 =
  36. 36.296 + 78 =
  37. 37.86 + 67 =
  38. 38.135 + 99 =
  39. 39.166 + 77 =
  40. 40.484 + 59 =

Answer key

  1. 323
  2. 141
  3. 67
  4. 469
  5. 151
  6. 304
  7. 443
  8. 426
  9. 472
  10. 211
  11. 529
  12. 175
  13. 361
  14. 179
  15. 306
  16. 444
  17. 152
  18. 73
  19. 485
  20. 411
  21. 178
  22. 60
  23. 456
  24. 237
  25. 280
  26. 328
  27. 171
  28. 433
  29. 320
  30. 420
  31. 496
  32. 376
  33. 288
  34. 53
  35. 409
  36. 374
  37. 153
  38. 234
  39. 243
  40. 543

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