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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 940 · 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. 1.323 + 37 =
  2. 2.466 + 38 =
  3. 3.263 + 57 =
  4. 4.276 + 89 =
  5. 5.455 + 69 =
  6. 6.482 + 47 =
  7. 7.345 + 77 =
  8. 8.231 + 68 =
  9. 9.277 + 67 =
  10. 10.476 + 39 =
  11. 11.226 + 69 =
  12. 12.131 + 59 =
  13. 13.269 + 17 =
  14. 14.183 + 48 =
  15. 15.238 + 68 =
  16. 16.99 + 18 =
  17. 17.353 + 47 =
  18. 18.203 + 49 =
  19. 19.240 + 77 =
  20. 20.276 + 68 =
  21. 21.488 + 17 =
  22. 22.52 + 47 =
  23. 23.72 + 89 =
  24. 24.411 + 88 =
  25. 25.205 + 97 =
  26. 26.384 + 68 =
  27. 27.458 + 98 =
  28. 28.463 + 49 =
  29. 29.78 + 18 =
  30. 30.494 + 38 =
  31. 31.267 + 79 =
  32. 32.196 + 99 =
  33. 33.73 + 97 =
  34. 34.327 + 98 =
  35. 35.316 + 48 =
  36. 36.187 + 27 =
  37. 37.422 + 79 =
  38. 38.192 + 68 =
  39. 39.298 + 37 =
  40. 40.90 + 59 =

Answer key

  1. 360
  2. 504
  3. 320
  4. 365
  5. 524
  6. 529
  7. 422
  8. 299
  9. 344
  10. 515
  11. 295
  12. 190
  13. 286
  14. 231
  15. 306
  16. 117
  17. 400
  18. 252
  19. 317
  20. 344
  21. 505
  22. 99
  23. 161
  24. 499
  25. 302
  26. 452
  27. 556
  28. 512
  29. 96
  30. 532
  31. 346
  32. 295
  33. 170
  34. 425
  35. 364
  36. 214
  37. 501
  38. 260
  39. 335
  40. 149

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