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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 920 · 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. 1.276 + 68 =
  2. 2.385 + 87 =
  3. 3.131 + 77 =
  4. 4.149 + 17 =
  5. 5.418 + 87 =
  6. 6.111 + 47 =
  7. 7.264 + 68 =
  8. 8.40 + 19 =
  9. 9.264 + 17 =
  10. 10.370 + 97 =
  11. 11.462 + 27 =
  12. 12.305 + 27 =
  13. 13.456 + 59 =
  14. 14.55 + 27 =
  15. 15.242 + 77 =
  16. 16.161 + 47 =
  17. 17.294 + 58 =
  18. 18.395 + 19 =
  19. 19.94 + 48 =
  20. 20.337 + 18 =
  21. 21.455 + 68 =
  22. 22.64 + 67 =
  23. 23.106 + 67 =
  24. 24.301 + 68 =
  25. 25.185 + 77 =
  26. 26.324 + 97 =
  27. 27.112 + 89 =
  28. 28.41 + 28 =
  29. 29.122 + 57 =
  30. 30.172 + 29 =
  31. 31.45 + 59 =
  32. 32.251 + 19 =
  33. 33.179 + 38 =
  34. 34.273 + 69 =
  35. 35.68 + 17 =
  36. 36.241 + 47 =
  37. 37.343 + 69 =
  38. 38.424 + 49 =
  39. 39.115 + 99 =
  40. 40.228 + 47 =

Answer key

  1. 344
  2. 472
  3. 208
  4. 166
  5. 505
  6. 158
  7. 332
  8. 59
  9. 281
  10. 467
  11. 489
  12. 332
  13. 515
  14. 82
  15. 319
  16. 208
  17. 352
  18. 414
  19. 142
  20. 355
  21. 523
  22. 131
  23. 173
  24. 369
  25. 262
  26. 421
  27. 201
  28. 69
  29. 179
  30. 201
  31. 104
  32. 270
  33. 217
  34. 342
  35. 85
  36. 288
  37. 412
  38. 473
  39. 214
  40. 275

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