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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 896 · 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. 1.261 + 69 =
  2. 2.119 + 48 =
  3. 3.416 + 57 =
  4. 4.175 + 48 =
  5. 5.101 + 87 =
  6. 6.55 + 38 =
  7. 7.104 + 98 =
  8. 8.270 + 97 =
  9. 9.486 + 49 =
  10. 10.141 + 27 =
  11. 11.344 + 59 =
  12. 12.423 + 27 =
  13. 13.372 + 19 =
  14. 14.313 + 99 =
  15. 15.450 + 99 =
  16. 16.368 + 78 =
  17. 17.498 + 39 =
  18. 18.94 + 39 =
  19. 19.180 + 18 =
  20. 20.139 + 57 =
  21. 21.408 + 88 =
  22. 22.89 + 17 =
  23. 23.260 + 79 =
  24. 24.240 + 28 =
  25. 25.362 + 89 =
  26. 26.157 + 17 =
  27. 27.249 + 77 =
  28. 28.100 + 28 =
  29. 29.257 + 69 =
  30. 30.66 + 99 =
  31. 31.267 + 48 =
  32. 32.36 + 49 =
  33. 33.337 + 67 =
  34. 34.207 + 48 =
  35. 35.449 + 27 =
  36. 36.377 + 69 =
  37. 37.57 + 39 =
  38. 38.295 + 98 =
  39. 39.305 + 77 =
  40. 40.253 + 69 =

Answer key

  1. 330
  2. 167
  3. 473
  4. 223
  5. 188
  6. 93
  7. 202
  8. 367
  9. 535
  10. 168
  11. 403
  12. 450
  13. 391
  14. 412
  15. 549
  16. 446
  17. 537
  18. 133
  19. 198
  20. 196
  21. 496
  22. 106
  23. 339
  24. 268
  25. 451
  26. 174
  27. 326
  28. 128
  29. 326
  30. 165
  31. 315
  32. 85
  33. 404
  34. 255
  35. 476
  36. 446
  37. 96
  38. 393
  39. 382
  40. 322

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