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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 964 · 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. 1.445 + 69 =
  2. 2.402 + 19 =
  3. 3.321 + 87 =
  4. 4.453 + 69 =
  5. 5.249 + 47 =
  6. 6.153 + 67 =
  7. 7.166 + 18 =
  8. 8.170 + 77 =
  9. 9.188 + 99 =
  10. 10.441 + 79 =
  11. 11.71 + 37 =
  12. 12.340 + 97 =
  13. 13.462 + 68 =
  14. 14.145 + 27 =
  15. 15.268 + 97 =
  16. 16.198 + 78 =
  17. 17.419 + 98 =
  18. 18.346 + 47 =
  19. 19.349 + 89 =
  20. 20.38 + 89 =
  21. 21.394 + 18 =
  22. 22.37 + 77 =
  23. 23.227 + 48 =
  24. 24.65 + 87 =
  25. 25.479 + 57 =
  26. 26.210 + 89 =
  27. 27.446 + 38 =
  28. 28.209 + 27 =
  29. 29.237 + 79 =
  30. 30.139 + 77 =
  31. 31.262 + 78 =
  32. 32.114 + 28 =
  33. 33.262 + 18 =
  34. 34.40 + 27 =
  35. 35.73 + 48 =
  36. 36.420 + 67 =
  37. 37.163 + 68 =
  38. 38.455 + 59 =
  39. 39.41 + 78 =
  40. 40.251 + 77 =

Answer key

  1. 514
  2. 421
  3. 408
  4. 522
  5. 296
  6. 220
  7. 184
  8. 247
  9. 287
  10. 520
  11. 108
  12. 437
  13. 530
  14. 172
  15. 365
  16. 276
  17. 517
  18. 393
  19. 438
  20. 127
  21. 412
  22. 114
  23. 275
  24. 152
  25. 536
  26. 299
  27. 484
  28. 236
  29. 316
  30. 216
  31. 340
  32. 142
  33. 280
  34. 67
  35. 121
  36. 487
  37. 231
  38. 514
  39. 119
  40. 328

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