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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 894 · 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. 1.387 + 87 =
  2. 2.249 + 59 =
  3. 3.83 + 27 =
  4. 4.484 + 57 =
  5. 5.131 + 68 =
  6. 6.47 + 89 =
  7. 7.354 + 28 =
  8. 8.65 + 27 =
  9. 9.417 + 79 =
  10. 10.309 + 99 =
  11. 11.249 + 88 =
  12. 12.379 + 39 =
  13. 13.212 + 69 =
  14. 14.31 + 59 =
  15. 15.219 + 79 =
  16. 16.213 + 57 =
  17. 17.428 + 28 =
  18. 18.256 + 99 =
  19. 19.299 + 27 =
  20. 20.140 + 17 =
  21. 21.373 + 97 =
  22. 22.368 + 29 =
  23. 23.304 + 59 =
  24. 24.185 + 18 =
  25. 25.371 + 29 =
  26. 26.176 + 77 =
  27. 27.339 + 37 =
  28. 28.368 + 79 =
  29. 29.449 + 29 =
  30. 30.75 + 67 =
  31. 31.281 + 88 =
  32. 32.284 + 19 =
  33. 33.120 + 79 =
  34. 34.25 + 97 =
  35. 35.301 + 48 =
  36. 36.213 + 87 =
  37. 37.217 + 17 =
  38. 38.158 + 57 =
  39. 39.375 + 77 =
  40. 40.100 + 39 =

Answer key

  1. 474
  2. 308
  3. 110
  4. 541
  5. 199
  6. 136
  7. 382
  8. 92
  9. 496
  10. 408
  11. 337
  12. 418
  13. 281
  14. 90
  15. 298
  16. 270
  17. 456
  18. 355
  19. 326
  20. 157
  21. 470
  22. 397
  23. 363
  24. 203
  25. 400
  26. 253
  27. 376
  28. 447
  29. 478
  30. 142
  31. 369
  32. 303
  33. 199
  34. 122
  35. 349
  36. 300
  37. 234
  38. 215
  39. 452
  40. 139

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