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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 956 · 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. 1.434 + 69 =
  2. 2.217 + 59 =
  3. 3.364 + 98 =
  4. 4.239 + 78 =
  5. 5.448 + 77 =
  6. 6.393 + 18 =
  7. 7.287 + 98 =
  8. 8.259 + 27 =
  9. 9.279 + 79 =
  10. 10.150 + 28 =
  11. 11.211 + 27 =
  12. 12.382 + 78 =
  13. 13.289 + 19 =
  14. 14.237 + 77 =
  15. 15.109 + 49 =
  16. 16.350 + 68 =
  17. 17.46 + 69 =
  18. 18.390 + 77 =
  19. 19.178 + 88 =
  20. 20.492 + 27 =
  21. 21.59 + 77 =
  22. 22.47 + 69 =
  23. 23.463 + 87 =
  24. 24.475 + 28 =
  25. 25.73 + 58 =
  26. 26.433 + 17 =
  27. 27.55 + 18 =
  28. 28.62 + 37 =
  29. 29.107 + 18 =
  30. 30.240 + 19 =
  31. 31.177 + 47 =
  32. 32.28 + 28 =
  33. 33.44 + 78 =
  34. 34.239 + 87 =
  35. 35.438 + 37 =
  36. 36.423 + 69 =
  37. 37.343 + 87 =
  38. 38.169 + 67 =
  39. 39.445 + 57 =
  40. 40.296 + 17 =

Answer key

  1. 503
  2. 276
  3. 462
  4. 317
  5. 525
  6. 411
  7. 385
  8. 286
  9. 358
  10. 178
  11. 238
  12. 460
  13. 308
  14. 314
  15. 158
  16. 418
  17. 115
  18. 467
  19. 266
  20. 519
  21. 136
  22. 116
  23. 550
  24. 503
  25. 131
  26. 450
  27. 73
  28. 99
  29. 125
  30. 259
  31. 224
  32. 56
  33. 122
  34. 326
  35. 475
  36. 492
  37. 430
  38. 236
  39. 502
  40. 313

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