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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 913 · 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. 1.210 + 89 =
  2. 2.201 + 57 =
  3. 3.220 + 87 =
  4. 4.421 + 38 =
  5. 5.134 + 17 =
  6. 6.153 + 78 =
  7. 7.115 + 88 =
  8. 8.307 + 28 =
  9. 9.322 + 18 =
  10. 10.407 + 17 =
  11. 11.124 + 79 =
  12. 12.470 + 17 =
  13. 13.95 + 27 =
  14. 14.32 + 39 =
  15. 15.496 + 98 =
  16. 16.363 + 67 =
  17. 17.325 + 79 =
  18. 18.202 + 69 =
  19. 19.130 + 28 =
  20. 20.422 + 47 =
  21. 21.198 + 58 =
  22. 22.81 + 97 =
  23. 23.34 + 68 =
  24. 24.133 + 78 =
  25. 25.403 + 28 =
  26. 26.482 + 77 =
  27. 27.319 + 99 =
  28. 28.313 + 88 =
  29. 29.192 + 18 =
  30. 30.108 + 99 =
  31. 31.389 + 27 =
  32. 32.225 + 77 =
  33. 33.88 + 28 =
  34. 34.44 + 87 =
  35. 35.248 + 59 =
  36. 36.149 + 27 =
  37. 37.458 + 87 =
  38. 38.147 + 79 =
  39. 39.435 + 27 =
  40. 40.195 + 59 =

Answer key

  1. 299
  2. 258
  3. 307
  4. 459
  5. 151
  6. 231
  7. 203
  8. 335
  9. 340
  10. 424
  11. 203
  12. 487
  13. 122
  14. 71
  15. 594
  16. 430
  17. 404
  18. 271
  19. 158
  20. 469
  21. 256
  22. 178
  23. 102
  24. 211
  25. 431
  26. 559
  27. 418
  28. 401
  29. 210
  30. 207
  31. 416
  32. 302
  33. 116
  34. 131
  35. 307
  36. 176
  37. 545
  38. 226
  39. 462
  40. 254

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