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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 917 · 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. 1.156 + 37 =
  2. 2.395 + 19 =
  3. 3.31 + 47 =
  4. 4.27 + 28 =
  5. 5.187 + 17 =
  6. 6.497 + 79 =
  7. 7.323 + 79 =
  8. 8.88 + 87 =
  9. 9.92 + 39 =
  10. 10.336 + 87 =
  11. 11.491 + 98 =
  12. 12.71 + 88 =
  13. 13.245 + 88 =
  14. 14.133 + 27 =
  15. 15.275 + 87 =
  16. 16.431 + 18 =
  17. 17.154 + 18 =
  18. 18.63 + 18 =
  19. 19.478 + 39 =
  20. 20.459 + 97 =
  21. 21.131 + 77 =
  22. 22.307 + 17 =
  23. 23.416 + 69 =
  24. 24.272 + 47 =
  25. 25.279 + 47 =
  26. 26.76 + 29 =
  27. 27.112 + 28 =
  28. 28.178 + 67 =
  29. 29.349 + 17 =
  30. 30.53 + 39 =
  31. 31.57 + 37 =
  32. 32.467 + 88 =
  33. 33.460 + 88 =
  34. 34.34 + 78 =
  35. 35.88 + 99 =
  36. 36.321 + 99 =
  37. 37.79 + 57 =
  38. 38.120 + 49 =
  39. 39.277 + 28 =
  40. 40.260 + 98 =

Answer key

  1. 193
  2. 414
  3. 78
  4. 55
  5. 204
  6. 576
  7. 402
  8. 175
  9. 131
  10. 423
  11. 589
  12. 159
  13. 333
  14. 160
  15. 362
  16. 449
  17. 172
  18. 81
  19. 517
  20. 556
  21. 208
  22. 324
  23. 485
  24. 319
  25. 326
  26. 105
  27. 140
  28. 245
  29. 366
  30. 92
  31. 94
  32. 555
  33. 548
  34. 112
  35. 187
  36. 420
  37. 136
  38. 169
  39. 305
  40. 358

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