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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 333 · 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. 1.447 + 38 =
  2. 2.424 + 58 =
  3. 3.152 + 97 =
  4. 4.259 + 77 =
  5. 5.25 + 49 =
  6. 6.73 + 88 =
  7. 7.435 + 19 =
  8. 8.390 + 27 =
  9. 9.282 + 28 =
  10. 10.431 + 19 =
  11. 11.79 + 68 =
  12. 12.476 + 59 =
  13. 13.111 + 27 =
  14. 14.273 + 38 =
  15. 15.452 + 28 =
  16. 16.40 + 17 =
  17. 17.146 + 99 =
  18. 18.81 + 79 =
  19. 19.271 + 17 =
  20. 20.161 + 69 =
  21. 21.171 + 97 =
  22. 22.415 + 38 =
  23. 23.85 + 77 =
  24. 24.226 + 29 =
  25. 25.319 + 29 =
  26. 26.282 + 87 =
  27. 27.489 + 49 =
  28. 28.357 + 59 =
  29. 29.31 + 89 =
  30. 30.120 + 27 =
  31. 31.192 + 78 =
  32. 32.274 + 97 =
  33. 33.496 + 97 =
  34. 34.64 + 27 =
  35. 35.259 + 39 =
  36. 36.220 + 68 =
  37. 37.433 + 37 =
  38. 38.351 + 87 =
  39. 39.307 + 59 =
  40. 40.412 + 58 =

Answer key

  1. 485
  2. 482
  3. 249
  4. 336
  5. 74
  6. 161
  7. 454
  8. 417
  9. 310
  10. 450
  11. 147
  12. 535
  13. 138
  14. 311
  15. 480
  16. 57
  17. 245
  18. 160
  19. 288
  20. 230
  21. 268
  22. 453
  23. 162
  24. 255
  25. 348
  26. 369
  27. 538
  28. 416
  29. 120
  30. 147
  31. 270
  32. 371
  33. 593
  34. 91
  35. 298
  36. 288
  37. 470
  38. 438
  39. 366
  40. 470

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