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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 915 · 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. 1.154 + 57 =
  2. 2.216 + 39 =
  3. 3.166 + 78 =
  4. 4.490 + 19 =
  5. 5.478 + 97 =
  6. 6.323 + 67 =
  7. 7.227 + 97 =
  8. 8.141 + 89 =
  9. 9.165 + 57 =
  10. 10.436 + 19 =
  11. 11.114 + 47 =
  12. 12.44 + 88 =
  13. 13.445 + 98 =
  14. 14.387 + 59 =
  15. 15.66 + 69 =
  16. 16.315 + 37 =
  17. 17.193 + 59 =
  18. 18.408 + 17 =
  19. 19.458 + 17 =
  20. 20.253 + 79 =
  21. 21.401 + 79 =
  22. 22.257 + 98 =
  23. 23.441 + 19 =
  24. 24.258 + 37 =
  25. 25.46 + 29 =
  26. 26.94 + 57 =
  27. 27.418 + 29 =
  28. 28.367 + 77 =
  29. 29.48 + 78 =
  30. 30.190 + 89 =
  31. 31.459 + 17 =
  32. 32.173 + 29 =
  33. 33.34 + 19 =
  34. 34.216 + 97 =
  35. 35.90 + 19 =
  36. 36.42 + 58 =
  37. 37.248 + 37 =
  38. 38.127 + 58 =
  39. 39.358 + 99 =
  40. 40.61 + 47 =

Answer key

  1. 211
  2. 255
  3. 244
  4. 509
  5. 575
  6. 390
  7. 324
  8. 230
  9. 222
  10. 455
  11. 161
  12. 132
  13. 543
  14. 446
  15. 135
  16. 352
  17. 252
  18. 425
  19. 475
  20. 332
  21. 480
  22. 355
  23. 460
  24. 295
  25. 75
  26. 151
  27. 447
  28. 444
  29. 126
  30. 279
  31. 476
  32. 202
  33. 53
  34. 313
  35. 109
  36. 100
  37. 285
  38. 185
  39. 457
  40. 108

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