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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 881 · 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. 1.52 + 18 =
  2. 2.296 + 17 =
  3. 3.358 + 48 =
  4. 4.194 + 47 =
  5. 5.364 + 97 =
  6. 6.476 + 27 =
  7. 7.79 + 87 =
  8. 8.456 + 77 =
  9. 9.495 + 38 =
  10. 10.455 + 58 =
  11. 11.272 + 28 =
  12. 12.258 + 17 =
  13. 13.138 + 79 =
  14. 14.318 + 27 =
  15. 15.99 + 17 =
  16. 16.270 + 89 =
  17. 17.300 + 77 =
  18. 18.65 + 57 =
  19. 19.307 + 17 =
  20. 20.208 + 27 =
  21. 21.389 + 98 =
  22. 22.193 + 19 =
  23. 23.212 + 88 =
  24. 24.136 + 57 =
  25. 25.204 + 27 =
  26. 26.128 + 47 =
  27. 27.153 + 77 =
  28. 28.416 + 99 =
  29. 29.273 + 67 =
  30. 30.73 + 98 =
  31. 31.262 + 49 =
  32. 32.208 + 57 =
  33. 33.105 + 77 =
  34. 34.323 + 89 =
  35. 35.111 + 59 =
  36. 36.243 + 88 =
  37. 37.378 + 19 =
  38. 38.438 + 29 =
  39. 39.401 + 98 =
  40. 40.247 + 67 =

Answer key

  1. 70
  2. 313
  3. 406
  4. 241
  5. 461
  6. 503
  7. 166
  8. 533
  9. 533
  10. 513
  11. 300
  12. 275
  13. 217
  14. 345
  15. 116
  16. 359
  17. 377
  18. 122
  19. 324
  20. 235
  21. 487
  22. 212
  23. 300
  24. 193
  25. 231
  26. 175
  27. 230
  28. 515
  29. 340
  30. 171
  31. 311
  32. 265
  33. 182
  34. 412
  35. 170
  36. 331
  37. 397
  38. 467
  39. 499
  40. 314

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