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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 825 · 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. 1.42 + 59 =
  2. 2.80 + 59 =
  3. 3.370 + 77 =
  4. 4.99 + 27 =
  5. 5.237 + 19 =
  6. 6.49 + 68 =
  7. 7.413 + 37 =
  8. 8.77 + 69 =
  9. 9.159 + 67 =
  10. 10.311 + 59 =
  11. 11.190 + 79 =
  12. 12.223 + 48 =
  13. 13.62 + 49 =
  14. 14.108 + 79 =
  15. 15.322 + 78 =
  16. 16.388 + 37 =
  17. 17.351 + 27 =
  18. 18.122 + 59 =
  19. 19.196 + 48 =
  20. 20.58 + 89 =
  21. 21.121 + 79 =
  22. 22.318 + 98 =
  23. 23.228 + 67 =
  24. 24.53 + 87 =
  25. 25.417 + 58 =
  26. 26.119 + 87 =
  27. 27.288 + 87 =
  28. 28.419 + 97 =
  29. 29.329 + 48 =
  30. 30.95 + 18 =
  31. 31.330 + 47 =
  32. 32.354 + 98 =
  33. 33.245 + 38 =
  34. 34.445 + 87 =
  35. 35.208 + 79 =
  36. 36.206 + 27 =
  37. 37.328 + 38 =
  38. 38.307 + 67 =
  39. 39.485 + 27 =
  40. 40.449 + 59 =

Answer key

  1. 101
  2. 139
  3. 447
  4. 126
  5. 256
  6. 117
  7. 450
  8. 146
  9. 226
  10. 370
  11. 269
  12. 271
  13. 111
  14. 187
  15. 400
  16. 425
  17. 378
  18. 181
  19. 244
  20. 147
  21. 200
  22. 416
  23. 295
  24. 140
  25. 475
  26. 206
  27. 375
  28. 516
  29. 377
  30. 113
  31. 377
  32. 452
  33. 283
  34. 532
  35. 287
  36. 233
  37. 366
  38. 374
  39. 512
  40. 508

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