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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 838 · 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. 1.441 + 49 =
  2. 2.204 + 78 =
  3. 3.199 + 68 =
  4. 4.268 + 98 =
  5. 5.483 + 68 =
  6. 6.196 + 77 =
  7. 7.349 + 48 =
  8. 8.447 + 47 =
  9. 9.441 + 78 =
  10. 10.478 + 89 =
  11. 11.209 + 58 =
  12. 12.116 + 18 =
  13. 13.137 + 89 =
  14. 14.86 + 39 =
  15. 15.345 + 49 =
  16. 16.174 + 27 =
  17. 17.159 + 39 =
  18. 18.98 + 67 =
  19. 19.97 + 98 =
  20. 20.38 + 79 =
  21. 21.169 + 97 =
  22. 22.111 + 37 =
  23. 23.389 + 17 =
  24. 24.382 + 67 =
  25. 25.342 + 98 =
  26. 26.91 + 38 =
  27. 27.487 + 57 =
  28. 28.111 + 79 =
  29. 29.203 + 58 =
  30. 30.129 + 57 =
  31. 31.469 + 77 =
  32. 32.202 + 29 =
  33. 33.214 + 28 =
  34. 34.496 + 48 =
  35. 35.34 + 47 =
  36. 36.454 + 58 =
  37. 37.209 + 38 =
  38. 38.106 + 68 =
  39. 39.101 + 48 =
  40. 40.353 + 57 =

Answer key

  1. 490
  2. 282
  3. 267
  4. 366
  5. 551
  6. 273
  7. 397
  8. 494
  9. 519
  10. 567
  11. 267
  12. 134
  13. 226
  14. 125
  15. 394
  16. 201
  17. 198
  18. 165
  19. 195
  20. 117
  21. 266
  22. 148
  23. 406
  24. 449
  25. 440
  26. 129
  27. 544
  28. 190
  29. 261
  30. 186
  31. 546
  32. 231
  33. 242
  34. 544
  35. 81
  36. 512
  37. 247
  38. 174
  39. 149
  40. 410

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