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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 965 · 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. 1.436 + 37 =
  2. 2.467 + 17 =
  3. 3.300 + 17 =
  4. 4.445 + 97 =
  5. 5.277 + 97 =
  6. 6.94 + 19 =
  7. 7.200 + 79 =
  8. 8.465 + 58 =
  9. 9.397 + 97 =
  10. 10.409 + 18 =
  11. 11.117 + 87 =
  12. 12.249 + 58 =
  13. 13.196 + 28 =
  14. 14.386 + 79 =
  15. 15.225 + 58 =
  16. 16.398 + 27 =
  17. 17.232 + 69 =
  18. 18.221 + 58 =
  19. 19.339 + 18 =
  20. 20.100 + 28 =
  21. 21.82 + 88 =
  22. 22.156 + 18 =
  23. 23.424 + 17 =
  24. 24.250 + 98 =
  25. 25.490 + 37 =
  26. 26.341 + 18 =
  27. 27.415 + 18 =
  28. 28.338 + 47 =
  29. 29.120 + 89 =
  30. 30.178 + 79 =
  31. 31.212 + 78 =
  32. 32.47 + 57 =
  33. 33.249 + 18 =
  34. 34.118 + 69 =
  35. 35.471 + 68 =
  36. 36.133 + 29 =
  37. 37.44 + 99 =
  38. 38.274 + 47 =
  39. 39.363 + 67 =
  40. 40.320 + 57 =

Answer key

  1. 473
  2. 484
  3. 317
  4. 542
  5. 374
  6. 113
  7. 279
  8. 523
  9. 494
  10. 427
  11. 204
  12. 307
  13. 224
  14. 465
  15. 283
  16. 425
  17. 301
  18. 279
  19. 357
  20. 128
  21. 170
  22. 174
  23. 441
  24. 348
  25. 527
  26. 359
  27. 433
  28. 385
  29. 209
  30. 257
  31. 290
  32. 104
  33. 267
  34. 187
  35. 539
  36. 162
  37. 143
  38. 321
  39. 430
  40. 377

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