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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 922 · 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. 1.267 + 58 =
  2. 2.171 + 58 =
  3. 3.229 + 39 =
  4. 4.129 + 58 =
  5. 5.92 + 77 =
  6. 6.420 + 87 =
  7. 7.167 + 87 =
  8. 8.136 + 28 =
  9. 9.154 + 39 =
  10. 10.417 + 17 =
  11. 11.356 + 37 =
  12. 12.397 + 37 =
  13. 13.390 + 79 =
  14. 14.48 + 38 =
  15. 15.267 + 79 =
  16. 16.363 + 87 =
  17. 17.136 + 28 =
  18. 18.217 + 19 =
  19. 19.166 + 38 =
  20. 20.464 + 17 =
  21. 21.428 + 58 =
  22. 22.204 + 29 =
  23. 23.195 + 89 =
  24. 24.308 + 97 =
  25. 25.482 + 18 =
  26. 26.29 + 19 =
  27. 27.38 + 17 =
  28. 28.399 + 78 =
  29. 29.69 + 49 =
  30. 30.132 + 38 =
  31. 31.408 + 59 =
  32. 32.29 + 37 =
  33. 33.456 + 47 =
  34. 34.361 + 47 =
  35. 35.234 + 69 =
  36. 36.154 + 97 =
  37. 37.334 + 59 =
  38. 38.394 + 78 =
  39. 39.284 + 49 =
  40. 40.340 + 67 =

Answer key

  1. 325
  2. 229
  3. 268
  4. 187
  5. 169
  6. 507
  7. 254
  8. 164
  9. 193
  10. 434
  11. 393
  12. 434
  13. 469
  14. 86
  15. 346
  16. 450
  17. 164
  18. 236
  19. 204
  20. 481
  21. 486
  22. 233
  23. 284
  24. 405
  25. 500
  26. 48
  27. 55
  28. 477
  29. 118
  30. 170
  31. 467
  32. 66
  33. 503
  34. 408
  35. 303
  36. 251
  37. 393
  38. 472
  39. 333
  40. 407

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