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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 499 · 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. 1.409 + 99 =
  2. 2.44 + 88 =
  3. 3.365 + 88 =
  4. 4.433 + 88 =
  5. 5.238 + 38 =
  6. 6.199 + 27 =
  7. 7.271 + 98 =
  8. 8.69 + 87 =
  9. 9.76 + 29 =
  10. 10.465 + 67 =
  11. 11.161 + 37 =
  12. 12.418 + 79 =
  13. 13.94 + 49 =
  14. 14.359 + 47 =
  15. 15.76 + 17 =
  16. 16.383 + 49 =
  17. 17.145 + 98 =
  18. 18.44 + 29 =
  19. 19.101 + 48 =
  20. 20.130 + 47 =
  21. 21.435 + 27 =
  22. 22.29 + 28 =
  23. 23.161 + 27 =
  24. 24.139 + 17 =
  25. 25.417 + 38 =
  26. 26.187 + 78 =
  27. 27.403 + 38 =
  28. 28.235 + 89 =
  29. 29.304 + 77 =
  30. 30.391 + 67 =
  31. 31.141 + 77 =
  32. 32.204 + 99 =
  33. 33.111 + 77 =
  34. 34.467 + 97 =
  35. 35.161 + 58 =
  36. 36.251 + 99 =
  37. 37.184 + 89 =
  38. 38.142 + 47 =
  39. 39.337 + 67 =
  40. 40.398 + 67 =

Answer key

  1. 508
  2. 132
  3. 453
  4. 521
  5. 276
  6. 226
  7. 369
  8. 156
  9. 105
  10. 532
  11. 198
  12. 497
  13. 143
  14. 406
  15. 93
  16. 432
  17. 243
  18. 73
  19. 149
  20. 177
  21. 462
  22. 57
  23. 188
  24. 156
  25. 455
  26. 265
  27. 441
  28. 324
  29. 381
  30. 458
  31. 218
  32. 303
  33. 188
  34. 564
  35. 219
  36. 350
  37. 273
  38. 189
  39. 404
  40. 465

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