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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 970 · 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. 1.168 + 37 =
  2. 2.341 + 97 =
  3. 3.241 + 39 =
  4. 4.293 + 47 =
  5. 5.30 + 98 =
  6. 6.457 + 59 =
  7. 7.77 + 47 =
  8. 8.435 + 17 =
  9. 9.267 + 49 =
  10. 10.127 + 17 =
  11. 11.177 + 38 =
  12. 12.298 + 69 =
  13. 13.45 + 37 =
  14. 14.496 + 87 =
  15. 15.183 + 89 =
  16. 16.58 + 99 =
  17. 17.118 + 39 =
  18. 18.281 + 58 =
  19. 19.223 + 38 =
  20. 20.161 + 79 =
  21. 21.292 + 89 =
  22. 22.487 + 47 =
  23. 23.186 + 77 =
  24. 24.36 + 28 =
  25. 25.406 + 68 =
  26. 26.231 + 37 =
  27. 27.87 + 27 =
  28. 28.106 + 48 =
  29. 29.36 + 77 =
  30. 30.372 + 27 =
  31. 31.496 + 67 =
  32. 32.245 + 68 =
  33. 33.468 + 19 =
  34. 34.54 + 87 =
  35. 35.382 + 47 =
  36. 36.258 + 27 =
  37. 37.490 + 68 =
  38. 38.155 + 78 =
  39. 39.424 + 59 =
  40. 40.169 + 58 =

Answer key

  1. 205
  2. 438
  3. 280
  4. 340
  5. 128
  6. 516
  7. 124
  8. 452
  9. 316
  10. 144
  11. 215
  12. 367
  13. 82
  14. 583
  15. 272
  16. 157
  17. 157
  18. 339
  19. 261
  20. 240
  21. 381
  22. 534
  23. 263
  24. 64
  25. 474
  26. 268
  27. 114
  28. 154
  29. 113
  30. 399
  31. 563
  32. 313
  33. 487
  34. 141
  35. 429
  36. 285
  37. 558
  38. 233
  39. 483
  40. 227

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