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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 867 · 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. 1.173 + 89 =
  2. 2.116 + 38 =
  3. 3.141 + 67 =
  4. 4.439 + 97 =
  5. 5.338 + 78 =
  6. 6.370 + 39 =
  7. 7.499 + 27 =
  8. 8.421 + 57 =
  9. 9.34 + 47 =
  10. 10.248 + 49 =
  11. 11.184 + 17 =
  12. 12.241 + 89 =
  13. 13.388 + 69 =
  14. 14.319 + 48 =
  15. 15.69 + 59 =
  16. 16.232 + 58 =
  17. 17.484 + 37 =
  18. 18.61 + 27 =
  19. 19.397 + 49 =
  20. 20.51 + 38 =
  21. 21.134 + 18 =
  22. 22.207 + 99 =
  23. 23.466 + 48 =
  24. 24.388 + 17 =
  25. 25.183 + 69 =
  26. 26.87 + 79 =
  27. 27.450 + 28 =
  28. 28.400 + 28 =
  29. 29.281 + 47 =
  30. 30.33 + 18 =
  31. 31.172 + 37 =
  32. 32.342 + 39 =
  33. 33.74 + 38 =
  34. 34.151 + 89 =
  35. 35.434 + 67 =
  36. 36.493 + 68 =
  37. 37.313 + 27 =
  38. 38.328 + 59 =
  39. 39.234 + 39 =
  40. 40.188 + 88 =

Answer key

  1. 262
  2. 154
  3. 208
  4. 536
  5. 416
  6. 409
  7. 526
  8. 478
  9. 81
  10. 297
  11. 201
  12. 330
  13. 457
  14. 367
  15. 128
  16. 290
  17. 521
  18. 88
  19. 446
  20. 89
  21. 152
  22. 306
  23. 514
  24. 405
  25. 252
  26. 166
  27. 478
  28. 428
  29. 328
  30. 51
  31. 209
  32. 381
  33. 112
  34. 240
  35. 501
  36. 561
  37. 340
  38. 387
  39. 273
  40. 276

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