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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 682 · 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. 1.498 + 49 =
  2. 2.61 + 98 =
  3. 3.104 + 49 =
  4. 4.363 + 48 =
  5. 5.331 + 58 =
  6. 6.67 + 78 =
  7. 7.82 + 99 =
  8. 8.394 + 27 =
  9. 9.237 + 77 =
  10. 10.264 + 59 =
  11. 11.247 + 68 =
  12. 12.303 + 77 =
  13. 13.130 + 19 =
  14. 14.76 + 28 =
  15. 15.157 + 17 =
  16. 16.392 + 27 =
  17. 17.35 + 97 =
  18. 18.93 + 58 =
  19. 19.234 + 39 =
  20. 20.482 + 77 =
  21. 21.209 + 37 =
  22. 22.197 + 87 =
  23. 23.166 + 67 =
  24. 24.170 + 47 =
  25. 25.291 + 98 =
  26. 26.236 + 99 =
  27. 27.229 + 48 =
  28. 28.366 + 29 =
  29. 29.310 + 88 =
  30. 30.381 + 57 =
  31. 31.333 + 99 =
  32. 32.206 + 29 =
  33. 33.243 + 87 =
  34. 34.232 + 19 =
  35. 35.484 + 99 =
  36. 36.484 + 79 =
  37. 37.77 + 77 =
  38. 38.233 + 89 =
  39. 39.255 + 48 =
  40. 40.33 + 58 =

Answer key

  1. 547
  2. 159
  3. 153
  4. 411
  5. 389
  6. 145
  7. 181
  8. 421
  9. 314
  10. 323
  11. 315
  12. 380
  13. 149
  14. 104
  15. 174
  16. 419
  17. 132
  18. 151
  19. 273
  20. 559
  21. 246
  22. 284
  23. 233
  24. 217
  25. 389
  26. 335
  27. 277
  28. 395
  29. 398
  30. 438
  31. 432
  32. 235
  33. 330
  34. 251
  35. 583
  36. 563
  37. 154
  38. 322
  39. 303
  40. 91

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