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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 770 · 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. 1.219 + 89 =
  2. 2.135 + 28 =
  3. 3.378 + 68 =
  4. 4.241 + 28 =
  5. 5.174 + 47 =
  6. 6.50 + 77 =
  7. 7.70 + 27 =
  8. 8.323 + 99 =
  9. 9.238 + 29 =
  10. 10.148 + 18 =
  11. 11.476 + 87 =
  12. 12.364 + 17 =
  13. 13.61 + 37 =
  14. 14.414 + 48 =
  15. 15.391 + 29 =
  16. 16.480 + 77 =
  17. 17.111 + 39 =
  18. 18.251 + 47 =
  19. 19.357 + 77 =
  20. 20.305 + 67 =
  21. 21.261 + 89 =
  22. 22.87 + 88 =
  23. 23.214 + 78 =
  24. 24.198 + 27 =
  25. 25.353 + 49 =
  26. 26.82 + 57 =
  27. 27.134 + 77 =
  28. 28.479 + 27 =
  29. 29.172 + 87 =
  30. 30.267 + 49 =
  31. 31.223 + 49 =
  32. 32.499 + 88 =
  33. 33.232 + 47 =
  34. 34.160 + 97 =
  35. 35.100 + 17 =
  36. 36.367 + 77 =
  37. 37.364 + 49 =
  38. 38.75 + 58 =
  39. 39.232 + 67 =
  40. 40.268 + 78 =

Answer key

  1. 308
  2. 163
  3. 446
  4. 269
  5. 221
  6. 127
  7. 97
  8. 422
  9. 267
  10. 166
  11. 563
  12. 381
  13. 98
  14. 462
  15. 420
  16. 557
  17. 150
  18. 298
  19. 434
  20. 372
  21. 350
  22. 175
  23. 292
  24. 225
  25. 402
  26. 139
  27. 211
  28. 506
  29. 259
  30. 316
  31. 272
  32. 587
  33. 279
  34. 257
  35. 117
  36. 444
  37. 413
  38. 133
  39. 299
  40. 346

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