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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 843 · 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. 1.170 + 17 =
  2. 2.198 + 89 =
  3. 3.133 + 67 =
  4. 4.447 + 87 =
  5. 5.462 + 19 =
  6. 6.106 + 19 =
  7. 7.88 + 68 =
  8. 8.470 + 97 =
  9. 9.272 + 57 =
  10. 10.485 + 97 =
  11. 11.441 + 78 =
  12. 12.396 + 67 =
  13. 13.36 + 48 =
  14. 14.457 + 89 =
  15. 15.452 + 97 =
  16. 16.257 + 57 =
  17. 17.173 + 57 =
  18. 18.104 + 17 =
  19. 19.455 + 99 =
  20. 20.387 + 38 =
  21. 21.106 + 97 =
  22. 22.151 + 49 =
  23. 23.112 + 59 =
  24. 24.66 + 29 =
  25. 25.413 + 18 =
  26. 26.471 + 39 =
  27. 27.55 + 37 =
  28. 28.201 + 18 =
  29. 29.69 + 19 =
  30. 30.363 + 59 =
  31. 31.126 + 67 =
  32. 32.271 + 87 =
  33. 33.123 + 67 =
  34. 34.202 + 47 =
  35. 35.89 + 87 =
  36. 36.133 + 89 =
  37. 37.149 + 29 =
  38. 38.314 + 98 =
  39. 39.418 + 39 =
  40. 40.421 + 99 =

Answer key

  1. 187
  2. 287
  3. 200
  4. 534
  5. 481
  6. 125
  7. 156
  8. 567
  9. 329
  10. 582
  11. 519
  12. 463
  13. 84
  14. 546
  15. 549
  16. 314
  17. 230
  18. 121
  19. 554
  20. 425
  21. 203
  22. 200
  23. 171
  24. 95
  25. 431
  26. 510
  27. 92
  28. 219
  29. 88
  30. 422
  31. 193
  32. 358
  33. 190
  34. 249
  35. 176
  36. 222
  37. 178
  38. 412
  39. 457
  40. 520

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